Was looking into the background of lighting efficiency when I came across this chart on the web. Useful. BTW, Part L defines energy efficient lighting as anything that equals or betters 40 lumens per watt. Click on the chart to make it open up larger in another window.
2 Apr 2009
Lumens per watt: a useful graph
Was looking into the background of lighting efficiency when I came across this chart on the web. Useful. BTW, Part L defines energy efficient lighting as anything that equals or betters 40 lumens per watt. Click on the chart to make it open up larger in another window.
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It's a bit out of date on the LED figure. (Although possibly representative of products available on the high street...?)
ReplyDeleteCree have broken through the top of that graph in the lab:
http://www.cree.com/press/press_detail.asp?i=1227101620851
Prices should be coming down as well, with breakthroughs being made in fabrication costs:
http://www.newscientist.com/article/dn16496-cheap-superefficient-led-lights-on-the-horizon.html
I would be interested to know if anyone has experimented with high efficiency, low cost, but low output solutions. eg. some sort of light emitting wallpaper :-)
A softer, more diffuse light source might actually be more pleasant in use...
Jim