10-26-08, 05:13 AM | #11 |
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CFL and lumens
I bought a few CFL yesterday, for our house and my parents in law's house.
For the living room we bought a 20w (100w equiv) 6500°K CFL. It's rated at 1090 lm (lumen) while the 2700°K one is rated at 1150. For the bed room we bought a 15w (75w equiv) 6500°K CFL. It's rated at 760 lm while the 2700°K one is rated at 800. For my bedside table we bought a 9w (45w equiv) 6500°K CFL. It's rated at 405 lm. It replaces a 5w (25w equiv) 2700°K, if I prefer the light quality of the newer one, I find it a little bit too strong for late evening and soon morning. I may swap with my wife's bedside table who is reading much more in bed then I do. In my stock I found one with the lumen rate written on it : a 8w (35w equiv) 2700°K rated at 290 lm. For my parents in law's chandelier we bought 6x5w (25w equiv) 2700°K rated at 180 lm. Denis.
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10-27-08, 11:35 AM | #12 |
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groar- did you buy the ones that look like natural light?
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10-27-08, 04:12 PM | #13 |
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Yes, we bought the 6500°K bulbs ie "natural" lights, while 2700°K are more "artificial" lights.
I didn't noticed the real price differences as we wanted to buy "natural" lights, but from what I remember it was at most 10% more expensive, while the choice was 10 times smaller... The web site of the store currently gives me only "404 not found"... Except the price a little bit more expensive and the lumens a little bit smaller, others specifications (life, dimensions...) are the same between the 2700°K and the 6500°K CFL I have. Denis.
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11-06-08, 08:57 AM | #14 |
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good info groar. I plan to change to CFLs the 1st of DEC.
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11-07-08, 10:00 PM | #15 |
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LED and lumens
I spent a couple of minutes this afternoon in my bulb store. On LED only a subset of one brand indicate the lumens of their LEDs. They were all 1W and composed of 20 LEDs. Here they are :
Denis.
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11-08-08, 12:04 AM | #16 |
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very interesting
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11-08-08, 08:45 AM | #17 |
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Yeah, I too have seen the major difference in lumens between colors. Its odd. I wonder how they measure lumens...
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11-09-08, 12:40 PM | #18 |
Lurking Renovator
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To measure lumens from a light source you typically use a photometer which counts photos. It has a defined size on the collector, you measure a precise distance from the source, and you need to know the directionality of the light (simply defined as the percentage of a sphere for elementary cases) to get your unit of lumens. So lumens has no accounting for the frequency of light.
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11-10-08, 06:04 AM | #19 |
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Excellent. Thanks.
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Tags |
cfl, led, lighting |
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