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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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#1
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Pendant light fitting - rating
A female friend has just bought an expensive pendant light fitting
which on examination has cable which I would rate at a minimum of 3, more like 5 amp, and a brass / ceramic bulbholder. The box clearly states 'Max bulb size is 60W halogen or 11W CFL.' Please tell me they're being a tad over cautious. She wants to fit a 100W halogen. GrahamC --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
#2
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Pendant light fitting - rating
Graham C wrote:
A female friend has just bought an expensive pendant light fitting which on examination has cable which I would rate at a minimum of 3, more like 5 amp, and a brass / ceramic bulbholder. The box clearly states 'Max bulb size is 60W halogen or 11W CFL.' Please tell me they're being a tad over cautious. She wants to fit a 100W halogen. GrahamC --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com I think the rating has more to do with heat dissipation than cable size. Too high a wattage bulb could lead to over-heating. I wouldn't go over 60W incandescent. Regarding CFLs, I think the rating are a bit idiotic. Certainly they won't put out as much heat for a given light output and the figures quoted are always for light output "equivalence" (rather than heat) even if we all know that the ratio in real life is much more like 4:1 than the oft quoted 5:1. That said, a "wrongly" rated CFL in the fitting may overheat its electronics leading to shortened life, even it it never actually risks being a fire hazard so it probably wouldn't be wise to assume that you could use a 60W CFL. Tim |
#3
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Pendant light fitting - rating
"Graham C" wrote in message ... A female friend has just bought an expensive pendant light fitting which on examination has cable which I would rate at a minimum of 3, more like 5 amp, and a brass / ceramic bulbholder. The box clearly states 'Max bulb size is 60W halogen or 11W CFL.' Please tell me they're being a tad over cautious. They are considering the heat generated, not the current its taking. Otherwise they wouldn't make a distinction between the type of bulb and would just list the watts alone. She wants to fit a 100W halogen. Unlikely to be suitable. |
#4
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Pendant light fitting - rating
In article ,
Graham C wrote: A female friend has just bought an expensive pendant light fitting which on examination has cable which I would rate at a minimum of 3, more like 5 amp, and a brass / ceramic bulbholder. The box clearly states 'Max bulb size is 60W halogen or 11W CFL.' Please tell me they're being a tad over cautious. She wants to fit a 100W halogen. It's not the cable that's the problem, but the ventilation of the fitting. -- From KT24 Using a RISC OS computer running v5.18 |
#5
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Pendant light fitting - rating
On Thu, 06 Nov 2014 23:01:30 +0000
Graham C wrote: A female friend has just bought an expensive pendant light fitting which on examination has cable which I would rate at a minimum of 3, more like 5 amp, and a brass / ceramic bulbholder. The box clearly states 'Max bulb size is 60W halogen or 11W CFL.' Please tell me they're being a tad over cautious. She wants to fit a 100W halogen. GrahamC --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com I have just bought a couple of not-too-expensive pendant lights for our kitchen, with metal shades, and a rating of "42W or 11W energy saver, shape GLS". I assumed the heat was the limiting factor, although it would be nice if there was some explanation. Of the available lamps nowadays, CFL, Halogen, LED, which produce the most and least heat for a similar light output, and how do they compare with the baseline of an incandescent? Maybe I can drill some ventilation holes in the top of the shades to increase their effective rating. -- Davey. |
#6
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Pendant light fitting - rating
In article ,
Davey writes: On Thu, 06 Nov 2014 23:01:30 +0000 Graham C wrote: A female friend has just bought an expensive pendant light fitting which on examination has cable which I would rate at a minimum of 3, more like 5 amp, and a brass / ceramic bulbholder. The box clearly states 'Max bulb size is 60W halogen or 11W CFL.' Please tell me they're being a tad over cautious. She wants to fit a 100W halogen. GrahamC --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com I have just bought a couple of not-too-expensive pendant lights for our kitchen, with metal shades, and a rating of "42W or 11W energy saver, shape GLS". I assumed the heat was the limiting factor, although it would be nice if there was some explanation. Of the available lamps nowadays, CFL, Halogen, LED, which produce the most and least heat for a similar light output, and how do they compare with the baseline of an incandescent? Filament produce the most heat (least efficient). CFL are in the middle. LED produces least heat (most efficient). However, it's not as simple as that. Filament lamps normally run at 200C bulb temperature, CFLs at 100C tube temperature, and LEDs have to run cooler than both those. So to a rough approximation, if a fitting can take a 100W filament lamp, it will only manage roughly same equivalent light output from the other technologies, i.e. 23W CFL, and probably less than 15W LED. If you put a 100W LED in there (supposing one existed), it would probably die in a few minutes. Maybe I can drill some ventilation holes in the top of the shades to increase their effective rating. For filament lamps, temperature rating of the lampholder is also a factor. A 100W bulb normally needs a class T2 lampholder which can run at over 200C, whereas a 60W bulb can get away with a lower rated T1 lampholder which can't run at 200C. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#8
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Pendant light fitting - rating
Compare Lumens and see what is the max Lumens you can get. I have a bulb
that claims to be 100watt equiv but is a 75 watt QI bulb inside a larger glass bulb. Some interesting LEDs now getting into the shops but you need to target Lumens to get a deent comparison. |
#9
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Pendant light fitting - rating
On Fri, 07 Nov 2014 09:03:05 GMT
DerbyBorn wrote: Compare Lumens and see what is the max Lumens you can get. I have a bulb that claims to be 100watt equiv but is a 75 watt QI bulb inside a larger glass bulb. Some interesting LEDs now getting into the shops but you need to target Lumens to get a deent comparison. I was in Morrisons yesterday, looking at their big display comparing the different bulb types, and Lumens was the one item that was not listed for comparison! That display has always annoyed me by having a big spread purporting to let you choose exactly the bulb you need, and then not having it in stock. A shame we don't have a real electrical shop in town, it's a choice between Morrisons and Tesco, neither of which I trust anyway. -- Davey. |
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