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Up to 131 lumens per watt with LED
 Cree Demonstrates 131 Lumens per Watt White LED[full disclosure MHW family owns some stock in Cree] ... Cree, Inc. (Nasdaq: CREE - News),..announced LED efficacy test results ... of 131 lumens per watt white LED efficacy, confirmed by the National Institute of Standards and Technology...LED chips operating at 20 mA and a correlated color temperature of 6027 K. I posted on RB when Cree got up to 80 lumens/watt a few weeks ago. That was a soft white suitable for reading, etc. This test was for a harsh white not suitable for reading. However, it does show yet more promise. Once again, for context, incandescent bulbs are about 20 lumens/watt, compact fluorescents about 60 lumens per watt. After the previous post we had a discussion about the nature and pace of the use of LEDs Posted by: mhw 2006-06-21 |
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