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Old 10-26-08, 06:13 AM   #11
groar
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Default 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) 6500K CFL. It's rated at 1090 lm (lumen) while the 2700K one is rated at 1150.

For the bed room we bought a 15w (75w equiv) 6500K CFL. It's rated at 760 lm while the 2700K one is rated at 800.

For my bedside table we bought a 9w (45w equiv) 6500K CFL. It's rated at 405 lm. It replaces a 5w (25w equiv) 2700K, 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) 2700K rated at 290 lm.

For my parents in law's chandelier we bought 6x5w (25w equiv) 2700K rated at 180 lm.

Denis.

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Old 10-27-08, 12:35 PM   #12
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groar- did you buy the ones that look like natural light?
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Old 10-27-08, 05:12 PM   #13
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Quote:
Originally Posted by toyobug View Post
groar- did you buy the ones that look like natural light?
Yes, we bought the 6500K bulbs ie "natural" lights, while 2700K 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 2700K and the 6500K CFL I have.

Denis.
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Earth absorbs 1.8 t CO2/head/yr, while a French generates 6.2 t CO2/yr
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
  • kg saved 06/08-08/09: 1816.9+382.9 (ecodriving / 1420mi not driven) = 2199.8
    To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
    (2.66 kg/l diesel)
  • kg saved by 3kWc photo-voltaic solar panels : 187 kg/yr
    To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
    (59.1 g/kWh)
Radioactive wastes saved by 3kWc photo-voltaic solar panels :
  • Long life (>100,000 years) : 2.85 g/yr (0.9 mg/kWh)
  • Short life (<300 years) : 31.7 g/yr (10.0 mg/kWh)
Based upon "official" French figures...
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Old 11-06-08, 09:57 AM   #14
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good info groar. I plan to change to CFLs the 1st of DEC.
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Old 11-07-08, 11:00 PM   #15
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Default 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 :
  • yellow : 7-10 lm
  • green : 30-45 lm
  • red : 8-12 lm
  • blue : 7-10 lm
  • white : no stock...
  • multiple colors : no stock...
I was also surprised to see so much difference... I simply copied what was written on the packaging.

Denis.
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Earth absorbs 1.8 t CO2/head/yr, while a French generates 6.2 t CO2/yr
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
  • kg saved 06/08-08/09: 1816.9+382.9 (ecodriving / 1420mi not driven) = 2199.8
    To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
    (2.66 kg/l diesel)
  • kg saved by 3kWc photo-voltaic solar panels : 187 kg/yr
    To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
    (59.1 g/kWh)
Radioactive wastes saved by 3kWc photo-voltaic solar panels :
  • Long life (>100,000 years) : 2.85 g/yr (0.9 mg/kWh)
  • Short life (<300 years) : 31.7 g/yr (10.0 mg/kWh)
Based upon "official" French figures...
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Old 11-08-08, 01:04 AM   #16
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very interesting
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Old 11-08-08, 09:45 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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Old 11-09-08, 01:40 PM   #18
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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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Old 11-10-08, 07:04 AM   #19
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Excellent. Thanks.

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