|
?Q?Re=3A_Why_is_hi=2Dvis_clothing_easier_to_see=3 F_What=E2=80=99s_s?=?Q?o_special_about_the_colour=3F?=
On Tuesday, 27 August 2019 17:25:45 UTC+1, Commander Kinsey wrote:
So why isn't red, yellow, etc as easy to see? If you wear a bright red tshirt, you aren't as visible as wearing a hi-vis jacket. Does it convert all the wavelengths into one or something? Not all, but some. It's fluorescent: The current standard that sets the requirements for high-visibility clothing is EN ISO 20471:2013, under the PPE Directive 89/686/EEC. This replaced the previous standard, EN 471:2003, in 2013. In addition to laying out requirements on the construction of the garments, CE marked and certified products must conform to strict requirements on the performance of the materials, their colour and the degree of reflection from the reflective strips. Hi-vis jackets and trousers have no €śactive€ť or light-emitting function, relying instead on an external light source for their luminescence. - the fluorescent material: this achieves visibility during the brighter part of the day but also helps to increase visibility at night https://www.healthandsafetyatwork.co...ble-difference In a 2009 literature review, nine papers were found that compared the visibility of fluorescent and non-fluorescent colours. All but one of those nine trials found that fluorescent colours were more visible to drivers. Fluorescent clothing in red, yellow and orange €” colours that contrast significantly with the riding environment €” was found to be most effective1. During the day, fluorescent clothing takes ultraviolet (UV) light from the sun €” light we cant see €” and converts it into light we can see. The result is an increase in the total amount of visible light thats reflected off the clothing, giving fluoro clothing a brighter appearance. This is particularly the case in low-light conditions, around dawn and dusk. https://cyclingtips.com/2016/06/does...make-us-safer/ Bright, synthetic and, above all, cheap, the ubiquity of high-visibility clothing means that it surely symbolises the Britain of 2010s in the same way that miniskirts summed up the 1960s. It was invented by an American, Bob Switzer, whose ambitions of becoming a doctor ended when he was injured in an industrial accident during the 1930s.. While recuperating, he developed a fluorescent paint before fashioning the first item of high-visibility clothing from his wife's wedding dress. High-vis first came to the UK in 1964 when it was trialled by railway maintenance workers in Glasgow. https://www.bbc.co.uk/news/magazine-14720101 Peter Rhodes, a lecturer in colour at Leeds University, said: €śThere is definitely an element of colour blindness. In safety you are trying to stand out. Conspicuity is the key element, not brightness per se. And if everyone wears hi-vis, people tend to ignore you.€ť The biggest market for it now is children. Yoko, a manufacturer and importer based in Birmingham, says it has made an estimated one million hi-vis vests for children in the last year alone. Many of these vests are bought by companies, such as Specsavers and Toyota, which print their logo on the back and give them to schools, who pass them on to pupils, who in turn become walking adverts for these companies. Clever. https://www.telegraph.co.uk/news/hea...ke-lemons.html Owain |
?B?V2h5IGlzIGhpLXZpcyBjbG90aGluZyBlYXNpZXIgdG8gc2 VlPyBXaGF0?=?B?4oCZcyBzbyBzcGVjaWFsIGFib3V0IHRoZSBjb2xvdXI/?=
On Tue, 27 Aug 2019 18:36:16 +0100, wrote:
On Tuesday, 27 August 2019 17:25:45 UTC+1, Commander Kinsey wrote: So why isn't red, yellow, etc as easy to see? If you wear a bright red tshirt, you aren't as visible as wearing a hi-vis jacket. Does it convert all the wavelengths into one or something? Not all, but some. It's fluorescent: The current standard that sets the requirements for high-visibility clothing is EN ISO 20471:2013, under the PPE Directive 89/686/EEC. This replaced the previous standard, EN 471:2003, in 2013. In addition to laying out requirements on the construction of the garments, CE marked and certified products must conform to strict requirements on the performance of the materials, their colour and the degree of reflection from the reflective strips. Hi-vis jackets and trousers have no €śactive€ť or light-emitting function, relying instead on an external light source for their luminescence. - the fluorescent material: this achieves visibility during the brighter part of the day but also helps to increase visibility at night https://www.healthandsafetyatwork.co...ble-difference In a 2009 literature review, nine papers were found that compared the visibility of fluorescent and non-fluorescent colours. All but one of those nine trials found that fluorescent colours were more visible to drivers. Fluorescent clothing in red, yellow and orange €” colours that contrast significantly with the riding environment €” was found to be most effective1. During the day, fluorescent clothing takes ultraviolet (UV) light from the sun €” light we cant see €” and converts it into light we can see. The result is an increase in the total amount of visible light thats reflected off the clothing, giving fluoro clothing a brighter appearance. This is particularly the case in low-light conditions, around dawn and dusk. https://cyclingtips.com/2016/06/does...make-us-safer/ Bright, synthetic and, above all, cheap, the ubiquity of high-visibility clothing means that it surely symbolises the Britain of 2010s in the same way that miniskirts summed up the 1960s. It was invented by an American, Bob Switzer, whose ambitions of becoming a doctor ended when he was injured in an industrial accident during the 1930s. While recuperating, he developed a fluorescent paint before fashioning the first item of high-visibility clothing from his wife's wedding dress. High-vis first came to the UK in 1964 when it was trialled by railway maintenance workers in Glasgow. https://www.bbc.co.uk/news/magazine-14720101 Peter Rhodes, a lecturer in colour at Leeds University, said: €śThere is definitely an element of colour blindness. In safety you are trying to stand out. Conspicuity is the key element, not brightness per se.. And if everyone wears hi-vis, people tend to ignore you.€ť The biggest market for it now is children. Yoko, a manufacturer and importer based in Birmingham, says it has made an estimated one million hi-vis vests for children in the last year alone. Many of these vests are bought by companies, such as Specsavers and Toyota, which print their logo on the back and give them to schools, who pass them on to pupils, who in turn become walking adverts for these companies. Clever. https://www.telegraph.co.uk/news/hea...ke-lemons.html Owain Ah I see, like fluorescent tubes. I didn't realise there was enough natural UV light to make that work, especially in the evening. I thought they also tend to fluoresce with car headlights? Is there UV in those? I agree with this sentence above though: "In safety you are trying to stand out. Conspicuity is the key element, not brightness per se. And if everyone wears hi-vis, people tend to ignore you." - I can accept a roadworker or a blind man wearing one, but when you see one every couple of minutes, they get ignored. It's like daytime running lights, we no longer see motorbikes and pedestrians, because our eyes are drawn to every single car's lights. |
Troll-feeding Senile IDIOT Alert!
On Tue, 27 Aug 2019 10:36:16 -0700 (PDT), wrote:
Not all, but some. It's fluorescent: ....and the first senile Google groper came running along to feed the retarded sociopathic Scottish ******! tsk |
?Q?Re=3a_Why_is_hi-vis_clothing_easier_to_see=3f_What?=?Q?=e2=80=99s_so_special_about_the_colour=3f?=
On 27/08/2019 18:47, Commander Kinsey wrote:
I agree with this sentence above though: "In safety you are trying to stand out. Conspicuity is the key element, not brightness per se. And if everyone wears hi-vis, people tend to ignore you." - I can accept a roadworker or a blind man wearing one, but when you see one every couple of minutes, they get ignored.Â* It's like daytime running lights, we no longer see motorbikes and pedestrians, because our eyes are drawn to every single car's lights. They rely on the reflective strips that some have. These have glass or plastic beads that reflect light back in the direction of the light source. -- Max Demian |
Troll-feeding Senile IDIOT Alert!
On Tue, 27 Aug 2019 22:41:10 +0100, Max Dumb, another mentally challenged,
troll-feeding, senile idiot blathered again: They rely on the reflective strips that some have. These have glass or plastic beads that reflect light back in the direction of the light source. HE relies on senile idiots like you to keep feeding him! And he's ALWAYS very successful with the dumbest among you seniles! |
Why is hi-vis clothing easier to see? What's so special about the colour?
OK in the 1960s you could get a two part paint. It used to be called Day
Glo. The basic stuff was a white undercoat and the colour you wanted on top. There was a green but most were amber or yellow. I used to paint it on parts of model aircraft since I was partially sighted and contrast was everything. I imagine the paint underneath reflected most of the uv so that the top coat could convert as much as possible into the colour needed. Brian -- ----- -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! wrote in message ... On Tuesday, 27 August 2019 17:25:45 UTC+1, Commander Kinsey wrote: So why isn't red, yellow, etc as easy to see? If you wear a bright red tshirt, you aren't as visible as wearing a hi-vis jacket. Does it convert all the wavelengths into one or something? Not all, but some. It's fluorescent: The current standard that sets the requirements for high-visibility clothing is EN ISO 20471:2013, under the PPE Directive 89/686/EEC. This replaced the previous standard, EN 471:2003, in 2013. In addition to laying out requirements on the construction of the garments, CE marked and certified products must conform to strict requirements on the performance of the materials, their colour and the degree of reflection from the reflective strips. Hi-vis jackets and trousers have no "active" or light-emitting function, relying instead on an external light source for their luminescence. - the fluorescent material: this achieves visibility during the brighter part of the day but also helps to increase visibility at night https://www.healthandsafetyatwork.co...ble-difference In a 2009 literature review, nine papers were found that compared the visibility of fluorescent and non-fluorescent colours. All but one of those nine trials found that fluorescent colours were more visible to drivers. Fluorescent clothing in red, yellow and orange - colours that contrast significantly with the riding environment - was found to be most effective1. During the day, fluorescent clothing takes ultraviolet (UV) light from the sun - light we can't see - and converts it into light we can see. The result is an increase in the total amount of visible light that's reflected off the clothing, giving fluoro clothing a brighter appearance. This is particularly the case in low-light conditions, around dawn and dusk. https://cyclingtips.com/2016/06/does...make-us-safer/ Bright, synthetic and, above all, cheap, the ubiquity of high-visibility clothing means that it surely symbolises the Britain of 2010s in the same way that miniskirts summed up the 1960s. It was invented by an American, Bob Switzer, whose ambitions of becoming a doctor ended when he was injured in an industrial accident during the 1930s. While recuperating, he developed a fluorescent paint before fashioning the first item of high-visibility clothing from his wife's wedding dress. High-vis first came to the UK in 1964 when it was trialled by railway maintenance workers in Glasgow. https://www.bbc.co.uk/news/magazine-14720101 Peter Rhodes, a lecturer in colour at Leeds University, said: "There is definitely an element of colour blindness. In safety you are trying to stand out. Conspicuity is the key element, not brightness per se. And if everyone wears hi-vis, people tend to ignore you." The biggest market for it now is children. Yoko, a manufacturer and importer based in Birmingham, says it has made an estimated one million hi-vis vests for children in the last year alone. Many of these vests are bought by companies, such as Specsavers and Toyota, which print their logo on the back and give them to schools, who pass them on to pupils, who in turn become walking adverts for these companies. Clever. https://www.telegraph.co.uk/news/hea...ke-lemons.html Owain |
?Q?Re=3a_Why_is_hi-vis_clothing_easier_to_see=3f_What?=?Q?=e2=80=99s_so_special_about_the_colour=3f?=
On 27/08/2019 18:47, Commander Kinsey wrote:
On Tue, 27 Aug 2019 18:36:16 +0100, wrote: On Tuesday, 27 August 2019 17:25:45 UTC+1, Commander KinseyÂ* wrote: So why isn't red, yellow, etc as easy to see?Â* If you wear a bright red tshirt, you aren't as visible as wearing a hi-vis jacket.Â* Does it convert all the wavelengths into one or something? Not all, but some. It's fluorescent: The current standard that sets the requirements for high-visibility clothing is EN ISO 20471:2013, under the PPE Directive 89/686/EEC. This replaced the previous standard, EN 471:2003, in 2013. In addition to laying out requirements on the construction of the garments, CE marked and certified products must conform to strict requirements on the performance of the materials, their colour and the degree of reflection from the reflective strips. Hi-vis jackets and trousers have no €śactive€ť or light-emitting function, relying instead on an external light source for their luminescence. Â* -Â* the fluorescent material: this achieves visibility during the brighter part of the day but also helps to increase visibility at night https://www.healthandsafetyatwork.co...ble-difference Â*In a 2009 literature review, nine papers were found that compared the visibility of fluorescent and non-fluorescent colours. All but one of those nine trials found that fluorescent colours were more visible to drivers. Fluorescent clothing in red, yellow and orange €” colours that contrast significantly with the riding environment €” was found to be most effective1. During the day, fluorescent clothing takes ultraviolet (UV) light from the sun €” light we cant see €” and converts it into light we can see. The result is an increase in the total amount of visible light thats reflected off the clothing, giving fluoro clothing a brighter appearance. This is particularly the case in low-light conditions, around dawn and dusk. https://cyclingtips.com/2016/06/does...make-us-safer/ Bright, synthetic and, above all, cheap, the ubiquity of high-visibility clothing means that it surely symbolises the Britain of 2010s in the same way that miniskirts summed up the 1960s. It was invented by an American, Bob Switzer, whose ambitions of becoming a doctor ended when he was injured in an industrial accident during the 1930s. While recuperating, he developed a fluorescent paint before fashioning the first item of high-visibility clothing from his wife's wedding dress. High-vis first came to the UK in 1964 when it was trialled by railway maintenance workers in Glasgow. https://www.bbc.co.uk/news/magazine-14720101 Peter Rhodes, a lecturer in colour at Leeds University, said: €śThere is definitely an element of colour blindness. In safety you are trying to stand out. Conspicuity is the key element, not brightness per se. And if everyone wears hi-vis, people tend to ignore you.€ť The biggest market for it now is children. Yoko, a manufacturer and importer based in Birmingham, says it has made an estimated one million hi-vis vests for children in the last year alone. Many of these vests are bought by companies, such as Specsavers and Toyota, which print their logo on the back and give them to schools, who pass them on to pupils, who in turn become walking adverts for these companies. Clever. https://www.telegraph.co.uk/news/hea...ke-lemons.html Ah I see, like fluorescent tubes.Â* I didn't realise there was enough natural UV light to make that work, especially in the evening.Â* I Actually in the early evening after sunset the scattered light from the blue sky is very UV rich as a proportion of the fading twilight. You can often see things fluorescing an hour or two after sunset at this time of year. If you are lucky you can also see faint electric blue notilucent clouds that are so high they remain in sunlight long after sunset. https://www.metoffice.gov.uk/weather...ds/noctilucent thought they also tend to fluoresce with car headlights?Â* Is there UV in those? The typical fluorescent dyes and pigments will convert blue and shorter wavelength photons into yellow, orange or red emitted light. The same fluorescent dyes are used in the cyalume cold chemical lights. The reason day-glo materials look so bright is that they emit more light of their selected colour than is present in the incident sunlight. -- Regards, Martin Brown |
Troll-feeding Senile IDIOTS Alert!
On Wed, 28 Aug 2019 10:30:14 +0100, Martin Brown, yet another mentally
challenged, troll-feeding, senile idiot, blathered: Actually in the early evening after sunset the scattered light from the FLUSH more troll fodder The Scottish ****** and troll thanks you nicely for feeding him with yet more troll fodder, troll-feeding senile idiot! This will make sure he will return to these groups, time and again ...just as long as it works! BG |
?B?V2h5IGlzIGhpLXZpcyBjbG90aGluZyBlYXNpZXIgdG8gc2 VlPyBXaGF0?=?B?4oCZcyBzbyBzcGVjaWFsIGFib3V0IHRoZSBjb2xvdXI/?=
On Wed, 28 Aug 2019 10:30:14 +0100, Martin Brown wrote:
On 27/08/2019 18:47, Commander Kinsey wrote: On Tue, 27 Aug 2019 18:36:16 +0100, wrote: On Tuesday, 27 August 2019 17:25:45 UTC+1, Commander Kinsey wrote: So why isn't red, yellow, etc as easy to see? If you wear a bright red tshirt, you aren't as visible as wearing a hi-vis jacket. Does it convert all the wavelengths into one or something? Not all, but some. It's fluorescent: The current standard that sets the requirements for high-visibility clothing is EN ISO 20471:2013, under the PPE Directive 89/686/EEC. This replaced the previous standard, EN 471:2003, in 2013. In addition to laying out requirements on the construction of the garments, CE marked and certified products must conform to strict requirements on the performance of the materials, their colour and the degree of reflection from the reflective strips. Hi-vis jackets and trousers have no €śactive€ť or light-emitting function, relying instead on an external light source for their luminescence. - the fluorescent material: this achieves visibility during the brighter part of the day but also helps to increase visibility at night https://www.healthandsafetyatwork.co...ble-difference In a 2009 literature review, nine papers were found that compared the visibility of fluorescent and non-fluorescent colours. All but one of those nine trials found that fluorescent colours were more visible to drivers. Fluorescent clothing in red, yellow and orange €” colours that contrast significantly with the riding environment €” was found to be most effective1. During the day, fluorescent clothing takes ultraviolet (UV) light from the sun €” light we cant see €” and converts it into light we can see. The result is an increase in the total amount of visible light thats reflected off the clothing, giving fluoro clothing a brighter appearance. This is particularly the case in low-light conditions, around dawn and dusk. https://cyclingtips.com/2016/06/does...make-us-safer/ Bright, synthetic and, above all, cheap, the ubiquity of high-visibility clothing means that it surely symbolises the Britain of 2010s in the same way that miniskirts summed up the 1960s. It was invented by an American, Bob Switzer, whose ambitions of becoming a doctor ended when he was injured in an industrial accident during the 1930s. While recuperating, he developed a fluorescent paint before fashioning the first item of high-visibility clothing from his wife's wedding dress. High-vis first came to the UK in 1964 when it was trialled by railway maintenance workers in Glasgow. https://www.bbc.co.uk/news/magazine-14720101 Peter Rhodes, a lecturer in colour at Leeds University, said: €śThere is definitely an element of colour blindness. In safety you are trying to stand out. Conspicuity is the key element, not brightness per se. And if everyone wears hi-vis, people tend to ignore you.€ť The biggest market for it now is children. Yoko, a manufacturer and importer based in Birmingham, says it has made an estimated one million hi-vis vests for children in the last year alone. Many of these vests are bought by companies, such as Specsavers and Toyota, which print their logo on the back and give them to schools, who pass them on to pupils, who in turn become walking adverts for these companies. Clever. https://www.telegraph.co.uk/news/hea...ke-lemons.html Ah I see, like fluorescent tubes. I didn't realise there was enough natural UV light to make that work, especially in the evening. I Actually in the early evening after sunset the scattered light from the blue sky is very UV rich as a proportion of the fading twilight. You can often see things fluorescing an hour or two after sunset at this time of year. If you are lucky you can also see faint electric blue notilucent clouds that are so high they remain in sunlight long after sunset. Then why don't we get a lot more suntan and sunburn in the evening? Those happen at midday. https://www.metoffice.gov.uk/weather...ds/noctilucent thought they also tend to fluoresce with car headlights? Is there UV in those? The typical fluorescent dyes and pigments will convert blue and shorter wavelength photons into yellow, orange or red emitted light. The same fluorescent dyes are used in the cyalume cold chemical lights. The reason day-glo materials look so bright is that they emit more light of their selected colour than is present in the incident sunlight. I see. :-) |
?Q?Re=3a_Why_is_hi-vis_clothing_easier_to_see=3f_What?=?Q?=e2=80=99s_so_special_about_the_colour=3f?=
On 28/08/2019 15:08, Commander Kinsey wrote:
On Wed, 28 Aug 2019 10:30:14 +0100, Martin Brown wrote: On 27/08/2019 18:47, Commander Kinsey wrote: On Tue, 27 Aug 2019 18:36:16 +0100, wrote: On Tuesday, 27 August 2019 17:25:45 UTC+1, Commander KinseyÂ* wrote: So why isn't red, yellow, etc as easy to see?Â* If you wear a bright red tshirt, you aren't as visible as wearing a hi-vis jacket.Â* Does it convert all the wavelengths into one or something? Not all, but some. It's fluorescent: The current standard that sets the requirements for high-visibility clothing is EN ISO 20471:2013, under the PPE Directive 89/686/EEC. This replaced the previous standard, EN 471:2003, in 2013. In addition to laying out requirements on the construction of the garments, CE marked and certified products must conform to strict requirements on the performance of the materials, their colour and the degree of reflection from the reflective strips. Hi-vis jackets and trousers have no €śactive€ť or light-emitting function, relying instead on an external light source for their luminescence. Â* -Â* the fluorescent material: this achieves visibility during the brighter part of the day but also helps to increase visibility at night https://www.healthandsafetyatwork.co...ble-difference Â*In a 2009 literature review, nine papers were found that compared the visibility of fluorescent and non-fluorescent colours. All but one of those nine trials found that fluorescent colours were more visible to drivers. Fluorescent clothing in red, yellow and orange €” colours that contrast significantly with the riding environment €” was found to be most effective1. During the day, fluorescent clothing takes ultraviolet (UV) light from the sun €” light we cant see €” and converts it into light we can see. The result is an increase in the total amount of visible light thats reflected off the clothing, giving fluoro clothing a brighter appearance. This is particularly the case in low-light conditions, around dawn and dusk. https://cyclingtips.com/2016/06/does...make-us-safer/ Bright, synthetic and, above all, cheap, the ubiquity of high-visibility clothing means that it surely symbolises the Britain of 2010s in the same way that miniskirts summed up the 1960s. It was invented by an American, Bob Switzer, whose ambitions of becoming a doctor ended when he was injured in an industrial accident during the 1930s. While recuperating, he developed a fluorescent paint before fashioning the first item of high-visibility clothing from his wife's wedding dress. High-vis first came to the UK in 1964 when it was trialled by railway maintenance workers in Glasgow. https://www.bbc.co.uk/news/magazine-14720101 Peter Rhodes, a lecturer in colour at Leeds University, said: €śThere is definitely an element of colour blindness. In safety you are trying to stand out. Conspicuity is the key element, not brightness per se. And if everyone wears hi-vis, people tend to ignore you.€ť The biggest market for it now is children. Yoko, a manufacturer and importer based in Birmingham, says it has made an estimated one million hi-vis vests for children in the last year alone. Many of these vests are bought by companies, such as Specsavers and Toyota, which print their logo on the back and give them to schools, who pass them on to pupils, who in turn become walking adverts for these companies. Clever. https://www.telegraph.co.uk/news/hea...ke-lemons.html Ah I see, like fluorescent tubes.Â* I didn't realise there was enough natural UV light to make that work, especially in the evening.Â* I Actually in the early evening after sunset the scattered light from the blue sky is very UV rich as a proportion of the fading twilight. You can often see things fluorescing an hour or two after sunset at this time of year. If you are lucky you can also see faint electric blue notilucent clouds that are so high they remain in sunlight long after sunset. Then why don't we get a lot more suntan and sunburn in the evening? Those happen at midday. It is the ratio of diffuse UV and blue light scattered from a clear sky to the low light level of dusk. In direct sunlight there is a lot more UV but there is much more visible light too. When the sun goes down the mid band visible light decreases fastest leaving some reds and UV. The intensity is well down but the proportion of UV is much higher. -- Regards, Martin Brown |
?B?V2h5IGlzIGhpLXZpcyBjbG90aGluZyBlYXNpZXIgdG8gc2 VlPyBXaGF0?=?B?4oCZcyBzbyBzcGVjaWFsIGFib3V0IHRoZSBjb2xvdXI/?=
On Wed, 28 Aug 2019 20:18:23 +0100, Martin Brown wrote:
On 28/08/2019 15:08, Commander Kinsey wrote: On Wed, 28 Aug 2019 10:30:14 +0100, Martin Brown wrote: On 27/08/2019 18:47, Commander Kinsey wrote: On Tue, 27 Aug 2019 18:36:16 +0100, wrote: On Tuesday, 27 August 2019 17:25:45 UTC+1, Commander Kinsey wrote: So why isn't red, yellow, etc as easy to see? If you wear a bright red tshirt, you aren't as visible as wearing a hi-vis jacket. Does it convert all the wavelengths into one or something? Not all, but some. It's fluorescent: The current standard that sets the requirements for high-visibility clothing is EN ISO 20471:2013, under the PPE Directive 89/686/EEC. This replaced the previous standard, EN 471:2003, in 2013. In addition to laying out requirements on the construction of the garments, CE marked and certified products must conform to strict requirements on the performance of the materials, their colour and the degree of reflection from the reflective strips. Hi-vis jackets and trousers have no €śactive€ť or light-emitting function, relying instead on an external light source for their luminescence. - the fluorescent material: this achieves visibility during the brighter part of the day but also helps to increase visibility at night https://www.healthandsafetyatwork.co...ble-difference In a 2009 literature review, nine papers were found that compared the visibility of fluorescent and non-fluorescent colours. All but one of those nine trials found that fluorescent colours were more visible to drivers. Fluorescent clothing in red, yellow and orange €” colours that contrast significantly with the riding environment €” was found to be most effective1. During the day, fluorescent clothing takes ultraviolet (UV) light from the sun €” light we cant see €” and converts it into light we can see. The result is an increase in the total amount of visible light thats reflected off the clothing, giving fluoro clothing a brighter appearance. This is particularly the case in low-light conditions, around dawn and dusk. https://cyclingtips.com/2016/06/does...make-us-safer/ Bright, synthetic and, above all, cheap, the ubiquity of high-visibility clothing means that it surely symbolises the Britain of 2010s in the same way that miniskirts summed up the 1960s. It was invented by an American, Bob Switzer, whose ambitions of becoming a doctor ended when he was injured in an industrial accident during the 1930s. While recuperating, he developed a fluorescent paint before fashioning the first item of high-visibility clothing from his wife's wedding dress. High-vis first came to the UK in 1964 when it was trialled by railway maintenance workers in Glasgow. https://www.bbc.co.uk/news/magazine-14720101 Peter Rhodes, a lecturer in colour at Leeds University, said: €śThere is definitely an element of colour blindness. In safety you are trying to stand out. Conspicuity is the key element, not brightness per se. And if everyone wears hi-vis, people tend to ignore you.€ť The biggest market for it now is children. Yoko, a manufacturer and importer based in Birmingham, says it has made an estimated one million hi-vis vests for children in the last year alone. Many of these vests are bought by companies, such as Specsavers and Toyota, which print their logo on the back and give them to schools, who pass them on to pupils, who in turn become walking adverts for these companies. Clever. https://www.telegraph.co.uk/news/hea...ke-lemons.html Ah I see, like fluorescent tubes. I didn't realise there was enough natural UV light to make that work, especially in the evening. I Actually in the early evening after sunset the scattered light from the blue sky is very UV rich as a proportion of the fading twilight. You can often see things fluorescing an hour or two after sunset at this time of year. If you are lucky you can also see faint electric blue notilucent clouds that are so high they remain in sunlight long after sunset. Then why don't we get a lot more suntan and sunburn in the evening? Those happen at midday. It is the ratio of diffuse UV and blue light scattered from a clear sky to the low light level of dusk. In direct sunlight there is a lot more UV but there is much more visible light too. When the sun goes down the mid band visible light decreases fastest leaving some reds and UV. The intensity is well down but the proportion of UV is much higher. Understood. |
Troll-feeding Senile IDIOT Alert!
On Wed, 28 Aug 2019 20:18:23 +0100, Martin Brown, another mentally
deficient, troll-feeding, senile idiot, blathered again: Then why don't we get a lot more suntan and sunburn in the evening? Those happen at midday. It is the ratio of diffuse UV and blue light scattered from a clear sky to the low light level of dusk. In direct sunlight there is a lot more UV but there is much more visible light too. When the sun goes down the mid band visible light decreases fastest leaving some reds and UV. The intensity is well down but the proportion of UV is much higher. You like talking to idiots, senile idiot? That's typical of senile idiots, you know! BG |
?Q?_Why_is_hi-vis_clothing_easier_to_see=3f_What=e2=80=99?=?Q?s_so_special_about_the_colour=3f?=
On 28/08/2019 20:34, Commander Kinsey wrote:
On Wed, 28 Aug 2019 20:18:23 +0100, Martin Brown wrote: On 28/08/2019 15:08, Commander Kinsey wrote: On Wed, 28 Aug 2019 10:30:14 +0100, Martin Brown wrote: On 27/08/2019 18:47, Commander Kinsey wrote: On Tue, 27 Aug 2019 18:36:16 +0100, wrote: On Tuesday, 27 August 2019 17:25:45 UTC+1, Commander KinseyÂ* wrote: So why isn't red, yellow, etc as easy to see?Â* If you wear a bright red tshirt, you aren't as visible as wearing a hi-vis jacket.Â* Does it convert all the wavelengths into one or something? Not all, but some. It's fluorescent: The current standard that sets the requirements for high-visibility clothing is EN ISO 20471:2013, under the PPE Directive 89/686/EEC. This replaced the previous standard, EN 471:2003, in 2013. In addition to laying out requirements on the construction of the garments, CE marked and certified products must conform to strict requirements on the performance of the materials, their colour and the degree of reflection from the reflective strips. Hi-vis jackets and trousers have no €śactive€ť or light-emitting function, relying instead on an external light source for their luminescence. Â* -Â* the fluorescent material: this achieves visibility during the brighter part of the day but also helps to increase visibility at night https://www.healthandsafetyatwork.co...ble-difference Â*In a 2009 literature review, nine papers were found that compared the visibility of fluorescent and non-fluorescent colours. All but one of those nine trials found that fluorescent colours were more visible to drivers. Fluorescent clothing in red, yellow and orange €” colours that contrast significantly with the riding environment €” was found to be most effective1. During the day, fluorescent clothing takes ultraviolet (UV) light from the sun €” light we cant see €” and converts it into light we can see. The result is an increase in the total amount of visible light thats reflected off the clothing, giving fluoro clothing a brighter appearance. This is particularly the case in low-light conditions, around dawn and dusk. https://cyclingtips.com/2016/06/does...make-us-safer/ Bright, synthetic and, above all, cheap, the ubiquity of high-visibility clothing means that it surely symbolises the Britain of 2010s in the same way that miniskirts summed up the 1960s. It was invented by an American, Bob Switzer, whose ambitions of becoming a doctor ended when he was injured in an industrial accident during the 1930s. While recuperating, he developed a fluorescent paint before fashioning the first item of high-visibility clothing from his wife's wedding dress. High-vis first came to the UK in 1964 when it was trialled by railway maintenance workers in Glasgow. https://www.bbc.co.uk/news/magazine-14720101 Peter Rhodes, a lecturer in colour at Leeds University, said: €śThere is definitely an element of colour blindness. In safety you are trying to stand out. Conspicuity is the key element, not brightness per se. And if everyone wears hi-vis, people tend to ignore you.€ť The biggest market for it now is children. Yoko, a manufacturer and importer based in Birmingham, says it has made an estimated one million hi-vis vests for children in the last year alone. Many of these vests are bought by companies, such as Specsavers and Toyota, which print their logo on the back and give them to schools, who pass them on to pupils, who in turn become walking adverts for these companies. Clever. https://www.telegraph.co.uk/news/hea...ke-lemons.html Ah I see, like fluorescent tubes.Â* I didn't realise there was enough natural UV light to make that work, especially in the evening.Â* I Actually in the early evening after sunset the scattered light from the blue sky is very UV rich as a proportion of the fading twilight. You can often see things fluorescing an hour or two after sunset at this time of year. If you are lucky you can also see faint electric blue notilucent clouds that are so high they remain in sunlight long after sunset. Then why don't we get a lot more suntan and sunburn in the evening? Those happen at midday. It is the ratio of diffuse UV and blue light scattered from a clear sky to the low light level of dusk. In direct sunlight there is a lot more UV but there is much more visible light too. When the sun goes down the mid band visible light decreases fastest leaving some reds and UV. The intensity is well down but the proportion of UV is much higher. Understood. Really? Prove it. |
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On Thu, 29 Aug 2019 01:53:34 +0100, Fredxx wrote:
On 28/08/2019 20:34, Commander Kinsey wrote: On Wed, 28 Aug 2019 20:18:23 +0100, Martin Brown wrote: On 28/08/2019 15:08, Commander Kinsey wrote: On Wed, 28 Aug 2019 10:30:14 +0100, Martin Brown wrote: On 27/08/2019 18:47, Commander Kinsey wrote: On Tue, 27 Aug 2019 18:36:16 +0100, wrote: On Tuesday, 27 August 2019 17:25:45 UTC+1, Commander Kinsey wrote: So why isn't red, yellow, etc as easy to see? If you wear a bright red tshirt, you aren't as visible as wearing a hi-vis jacket. Does it convert all the wavelengths into one or something? Not all, but some. It's fluorescent: The current standard that sets the requirements for high-visibility clothing is EN ISO 20471:2013, under the PPE Directive 89/686/EEC. This replaced the previous standard, EN 471:2003, in 2013. In addition to laying out requirements on the construction of the garments, CE marked and certified products must conform to strict requirements on the performance of the materials, their colour and the degree of reflection from the reflective strips. Hi-vis jackets and trousers have no €śactive€ť or light-emitting function, relying instead on an external light source for their luminescence. - the fluorescent material: this achieves visibility during the brighter part of the day but also helps to increase visibility at night https://www.healthandsafetyatwork.co...ble-difference In a 2009 literature review, nine papers were found that compared the visibility of fluorescent and non-fluorescent colours. All but one of those nine trials found that fluorescent colours were more visible to drivers. Fluorescent clothing in red, yellow and orange €” colours that contrast significantly with the riding environment €” was found to be most effective1. During the day, fluorescent clothing takes ultraviolet (UV) light from the sun €” light we cant see €” and converts it into light we can see. The result is an increase in the total amount of visible light thats reflected off the clothing, giving fluoro clothing a brighter appearance. This is particularly the case in low-light conditions, around dawn and dusk. https://cyclingtips.com/2016/06/does...make-us-safer/ Bright, synthetic and, above all, cheap, the ubiquity of high-visibility clothing means that it surely symbolises the Britain of 2010s in the same way that miniskirts summed up the 1960s. It was invented by an American, Bob Switzer, whose ambitions of becoming a doctor ended when he was injured in an industrial accident during the 1930s. While recuperating, he developed a fluorescent paint before fashioning the first item of high-visibility clothing from his wife's wedding dress. High-vis first came to the UK in 1964 when it was trialled by railway maintenance workers in Glasgow. https://www.bbc.co.uk/news/magazine-14720101 Peter Rhodes, a lecturer in colour at Leeds University, said: €śThere is definitely an element of colour blindness. In safety you are trying to stand out. Conspicuity is the key element, not brightness per se. And if everyone wears hi-vis, people tend to ignore you.€ť The biggest market for it now is children. Yoko, a manufacturer and importer based in Birmingham, says it has made an estimated one million hi-vis vests for children in the last year alone. Many of these vests are bought by companies, such as Specsavers and Toyota, which print their logo on the back and give them to schools, who pass them on to pupils, who in turn become walking adverts for these companies. Clever. https://www.telegraph.co.uk/news/hea...ke-lemons.html Ah I see, like fluorescent tubes. I didn't realise there was enough natural UV light to make that work, especially in the evening. I Actually in the early evening after sunset the scattered light from the blue sky is very UV rich as a proportion of the fading twilight. You can often see things fluorescing an hour or two after sunset at this time of year. If you are lucky you can also see faint electric blue notilucent clouds that are so high they remain in sunlight long after sunset. Then why don't we get a lot more suntan and sunburn in the evening? Those happen at midday. It is the ratio of diffuse UV and blue light scattered from a clear sky to the low light level of dusk. In direct sunlight there is a lot more UV but there is much more visible light too. When the sun goes down the mid band visible light decreases fastest leaving some reds and UV. The intensity is well down but the proportion of UV is much higher. Understood. Really? Prove it. What a stupid thing to say. |
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