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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#41
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'Daylight' LED lights
On 23/11/2019 14:21, alan_m wrote:
On 23/11/2019 11:21, Dave Plowman (News) wrote: In article , Â*Â*Â* alan_m wrote: All large supermarkets will use different colour temperature light fittings over the fruit and fresh meat counters. With (green) grapes you cannot see the over-ripe ones until you view them under the lighting in other parts of the store. Which does rather show the importance of using decent continuous spectrum lighting of the correct colour temperature. Unless you like not being able to see things at home. That's why you need daylight type bulbs at home. Supermarkets use different colour temperature lights not to give you true information about their products but to disguise anything that may look unappetising or a bit dodgy. I do appreciate that those who not do want to see the dust/dirt and perhaps have a poor hygiene cleaning regime in their homes will always opt for the more traditional artificial warm white lighting. Very droll :-) -- Cheers, Rob |
#42
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'Daylight' LED lights
On 24/11/2019 15:15:15, Dave Plowman (News) wrote:
In article , Fredxx wrote: On 24/11/2019 12:56:08, Dave Plowman (News) wrote: In article , Ray wrote: Which does rather show the importance of using decent continuous spectrum lighting of the correct colour temperature. Unless you like not being able to see things at home. Doesn€˜t have to be continuous spectrum. The Philips Hue white ambiance works fine for being able to see if the green grapes are over ripe. Green isn't the only colour in the spectrum. Nor is it the only colour in a discontinuous spectrum. What's your point? The one I made and you've quoted at the top of this post. Which bit didn't you understand? The point you were making is you didn't know there were more colours than green in a discontinuous spectrum. |
#43
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'Daylight' LED lights
On 23/11/2019 18:03, Sn!pe wrote:
We painted our walls in 'Calico' #e3ba93 (it looks a lot lighter on the walls.) When we installed CFLs it looked like baby ****. Fortunately, I had laid in a stock of Chinese incandescent lamps before they became illegal. Try some other LEDs. We've got Calico, and never had that impression. Andy |
#44
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'Daylight' LED lights
"Vir Campestris" wrote in message
... On 23/11/2019 18:03, Sn!pe wrote: We painted our walls in 'Calico' #e3ba93 (it looks a lot lighter on the walls.) When we installed CFLs it looked like baby ****. Fortunately, I had laid in a stock of Chinese incandescent lamps before they became illegal. Try some other LEDs. We've got Calico, and never had that impression. I've not noticed odd colour rendition with CFLs or LEDs, *in normal usage*. I can see differences in photographs if I do a test with specific coloured objects (eg red is darker and blue becomes more violet), having auto-balanced the camera against a sheet of white paper illuminated by the relevant light for each test. What I have noticed with "daylight" CFLs is a faint greenish cast in a room lit by them when my eyes are adjusted to a room lit by daylight LED bulbs or "tungsten" LEDs. Colour charts for paint are notoriously inaccurate. We bought some "terracotta" emulsion paint, judging the colour from the colour chart and from the paint in the transparent plastic "tin" that it came in. It was the correct colour when it went on, but it dried a much lighter pink rather than a darker colour of a terracotta plant pot. Then we bought some very pale green paint for the bathroom, and that dried vivid, almost fluorescent green. So we bought some replacement paint which looked very pale green on the colour chart (though pale blue when viewed on the online colour chart). Given that the colour was described as "Jade White" you'd expect green. But it was actually pale blue. We decided to live with that. And both of us see it as blue on the wall (and both of us saw it as green on the colour chart), so it's not a problem with one of us having funny colour perception. OK, there are some things my wife and I *do* see differently. Remember "that dress" which was the topic of hot debate on the internet the other year? I see it as white (or very pale blue) and gold, whereas my wife sees it as it should be (mid blue and black). I think, in the absence of any reference point, my guess of white and gold is more plausible (allowing for camera possible balanced for tungsten light, but viewing something in daylight), and that it was evidently *very* overexposed making mid blue and black render as pale blue and gold (as determined by the RGB values) in the photo). So the mystery is how a sizeable proportion of the population were able (correctly) to make a very large correction for a grossly overexposed photo, rather than seeing it as the photo reproduced it. Likewise, we beg to differ on the "yanni/laurel" audio clip that was being discussed earlier this year. |
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