Thread: How much light is enough?
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Old 08-19-08 | 11:27 PM
  #48  
mjw
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Joined: Jun 2008
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From: Washington, DC
Hopefully OLED lights will become practical over the next 5 years or so. Over 70 lumens per watt...

http://www.treehugger.com/files/2008...-princeton.php
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