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[DPRG] RBNO discussion of light bulb efficiency
Subject: [DPRG] RBNO discussion of light bulb efficiency
From: R. Steven Rainwater
srainwater at ncc.com
Date: Wed Jan 9 15:06:43 CST 2008
This is a little off-topic perhaps but there was some discussion of how
efficient various types of light bulbs are last night's at the RBNO. I
ran across a couple of sites with some info on bulb efficiency and it
breaks down something like this:
Incandescent bulbs: 10-20 lumens per watt (higher power bulbs are more
efficient) and a 750 to 1,000 hour lifespan. See table of power vs
lumens here: http://en.wikipedia.org/wiki/Incandescent_light_bulb
Compact fluorescent bulbs: 50-60 lumens per watt and a 6,000 to 15,000
hour lifespan - if you don't mind destroying the environment with toxic
mercury, anyway. ;) Efficiency chart can be found here:
http://en.wikipedia.org/wiki/Compact_fluorescent_lamp
LED bulbs: 100+ lumens per watt and 100,000+ hour lifespan. Also ran
across a article claiming the luminous intensity of LEDs doubles every
18 months, which would mean LEDs could replace even the long flourescent
tube lamps by 2010. see this Gizmodo article mentioning a 130 lumen per
watt white LED that set a new record back for a commercially available
LED in Jun 2006:
http://gizmodo.com/gadgets/gadgets/ultra-high-efficiency-led-created-182241.php
The record for OLED lighting is 64 lumens per watt:
http://www.ledsmagazine.com/news/4/3/29
-Steve
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