Efficiency of various light sources

Submitted: Friday, Jan 14, 2005 at 15:12
ThreadID: 19367 Views:2679 Replies:5 FollowUps:2
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Hi all,

There has been discussion recently about use of LED lights.

I have come across a useful site which has a wealth of info about all types of lighting systems.
http://members.misty.com/don/light.html

Amongst some of the useful info I found is data on efficiency of various types of light.
240v incandescent 17 lumen/watt
12v halogen 21 lumen/watt
White white LED 33 lumen/watt 2004 data. Improvement expected in 2005
Compact Flouro 45-60 lumen/watt
32W T8 tube flouro 80 lumen/watt

As can be seen LEDs still have a long way to go to equal the efficiency of flouros

Interestingly the spectrum of flouros and white LEDs better matches the response of the human eye in low light conditions so the gain over incandescent lights is even greater in other than bright light.

Phil I

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