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PostPosted: Fri 20 May 2011 10:33 
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White power LED achieves 230 lumen per watt

This snippet is from the e-newsletter of Elektor magazine. http://elektor.com 20 May 2011.

Cree, Inc. reports another industry-best efficacy record of 231 lumens per watt for a white power LED. This result is a significant advance beyond Cree’s previous industry record and further demonstrates how Cree’s relentless innovation continues to push the boundaries of what is possible with LED lighting. Cree reports that the LED efficacy... Read more http://dbaseserver.mistermail.nl/t/1036 ... /210787/0/

To put this in context, a 4W 'Oldham' style caplamp would probably produce around 40 lumens at around 10 lm/W. So if you are happy with a 40 lumen light source, this new LED would draw around 170 mW and so a single recharegable AA NiMH 'hybrid' cell (2100 mAh) would last around 14.5 hours.
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