You are viewing an obsolete version of the DU website which is no longer supported by the Administrators. Visit The New DU.
Democratic Underground Latest Greatest Lobby Journals Search Options Help Login

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

Printer-friendly format Printer-friendly format
Printer-friendly format Email this thread to a friend
Printer-friendly format Bookmark this thread
This topic is archived.
Home » Discuss » Topic Forums » Environment/Energy Donate to DU
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
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 ...
Printer Friendly | Permalink |  | Top

Home » Discuss » Topic Forums » Environment/Energy Donate to DU

Powered by DCForum+ Version 1.1 Copyright 1997-2002
Software has been extensively modified by the DU administrators

Important Notices: By participating on this discussion board, visitors agree to abide by the rules outlined on our Rules page. Messages posted on the Democratic Underground Discussion Forums are the opinions of the individuals who post them, and do not necessarily represent the opinions of Democratic Underground, LLC.

Home  |  Discussion Forums  |  Journals |  Store  |  Donate

About DU  |  Contact Us  |  Privacy Policy

Got a message for Democratic Underground? Click here to send us a message.

© 2001 - 2011 Democratic Underground, LLC