Talk:Lighting/Archives/2015
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Energy consumption
"Artificial lighting consumes approximately one quarter of all energy consumed worldwide." I can't believe it. As a rule of thumb, energy consumption in a developped country is ventilated as one quarter each for industry | agriculture | transport | habitation. Especially habitation is illuminated, and I suppose energy consumption is much lower than for heating. Perhaps It's one quater of electricity consumption? I replaced the term by "a significant part". --Marc Lacoste 10:47, 17 April 2006 (UTC)
- "Energy" is commonly used as a synonym for "electricity" in American English. The editor probably meant one quarter of all electricity. -kotra (talk) 08:02, 31 December 2007 (UTC)
I'm not sure if your calculation of power consumption is correct: A single 100 W light bulb used just 6 hours a day can cost over $25 per year to use (.12/kWh). My calculation: 100W x 6h/day x 365 days/year = 219000Wh or 219kWh per year. (Jesus Bermudez)
I have noticed that in this section, there is a reference to lighting in homes and offices using up 20 to 50 percent of the total energy. The study that is cited is quite old, from 2000. With all the new development in lighting technology since then (and even with the then ongoing migration away from incandescent lighting), can this figure still be considered accurate? For example, look at the following source: http://www.eia.gov/tools/faqs/faq.cfm?id=99&t=3 . - David