Talk:LED lamp

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Technology[edit]

I'm missing more information about the electronics inside the lamp (for household application) and how the AC current is converted to a DC supply. Riki (talk) 12:43, 29 September 2014 (UTC)

Incorrect info in article.[edit]

Article claims, "A 100 W light bulb for 120 V operation emits about 1,180 lumens, about 11.8 lumens/W; for 230 V bulbs the figures are 1340 lm and 13.4 lm/W." and helpfully provides a reference.

Although the reference does support the claim for 230 volt bulbs, it does not support the claim for the 120 volt. This is not surprising because the quoted figures are wrong. 120 volt 100 watt bulbs have filaments that are four times the cross section area of 230 volt (because they consume four times the current). As such the surface area to volume ratio is lower and this permits the filaments to operate at higher temperatures for the same average life. The official light output of a 120 volt 100 watt lamp is 1700 Lumens (ref [1]) Article adjusted accordingly. DieSwartzPunkt (talk) 16:37, 30 September 2014 (UTC)

Cold temperature operation?[edit]

I have found from personal experience that a 60 watt cfl bulb in an outdoor fixture did not last more than 3 months during the winter even though it was turned off in the daytime. A fluorescent fixture in my uninsulated attic would not start in cold weather.1archie99 (talk) 16:12, 22 November 2014 (UTC)