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Reply #14: Websearch suggests claims run from 150 to 400 lumens for 3w 120v bulbs [View All]

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struggle4progress Donating Member (1000+ posts) Send PM | Profile | Ignore Tue Apr-13-10 06:31 PM
Response to Reply #7
14. Websearch suggests claims run from 150 to 400 lumens for 3w 120v bulbs
For the ones I've tried, I might guesstimate 200-250 lumens, based on not-terribly-scientific visual comparison with other lighting sources: four of my 3w bulbs will do me for working in a room after dark, though I might be slightly happier with five bulbs.

I don't know for sure, but it's my impression you're wrong about conversion efficiency, though there has been some ongoing debate about total efficiency comparisons between LEDs and CFLs when taking into account manufacturing energy:

August 4, 2009, 12:01 AM
LEDs Are As Energy Efficient as Compact Fluorescents
By ERIC A. TAUB
While theres no question that LED lamps use a fraction of the energy to produce the same amount of light compared with a standard incandescent bulb, several Bits readers have pointed out that thats only half the story. If the energy used to create and dispose of the LED lamp is more than that for a comparable standard bulb, then all of the proclaimed energy savings to produce light are for naught. Until recently, no one knew if that was the case. In March, a preliminary study reported by Carnegie Mellon indicated that LED lamps were more energy efficient throughout their life, but the researchers pointed out that not every aspect of the production process was taken into account. A new study released on Tuesday by Osram, the German lighting giant, claims to have confirmed the efficiency findings ... http://bits.blogs.nytimes.com/2009/08/04/leds-as-energy...
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