02GF74
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| posted on 21/11/08 at 08:38 PM |
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high power LED efficiency - your google chalenge
I am trying to find the efficiency (electrical power in vs light power power out) to work out efficiency of high power LED (aka emitter) so that I can
work out waste power dissipated.
So far not found anything in google - can you help?
That is your challenge for tonight! 
[Edited on 21/11/08 by 02GF74]
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blakep82
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| posted on 21/11/08 at 08:40 PM |
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not more homework 
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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smart51
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| posted on 21/11/08 at 08:49 PM |
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LEDs are usually quoted in candela - the amount of light in a cone. It makes them sound better because of the narrow beam they produce. Candelas are
the number of lumens per steridian, a dimensionless unit of a cone. I believe there are 12 PI steradians in a sphere. In any case, lumens - the
amount of light, is a form of power and Wikipedia or google will tell you how many lumens there are in a watt. About 600 or so. A bit of maths will
therefore convert candelas to watts of light emitted. The rest of the power put into the LED will be heat.
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Bigheppy
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| posted on 21/11/08 at 09:09 PM |
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special brew + homework = very low candela + hot sweats = low efficiency
Tee hee not very BRIGHT 
[Edited on 21/11/08 by Bigheppy]
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Werner Van Loock
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| posted on 21/11/08 at 09:29 PM |
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is this of any usefullness?
http://en.wikipedia.org/wiki/LED#Efficiency_and_operational_parameters
http://www.clubstylus.be
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DarrenW
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| posted on 21/11/08 at 09:51 PM |
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Vodka - im out!
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JoelP
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| posted on 21/11/08 at 10:36 PM |
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this has been on my mind too recently as i need to make a VERY bright torch. I was torn between a non-roadlegal 100w headlight bulb running off a car
battery, or maybe a zenon bulb.
No idea about efficiency though!
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locoboy
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| posted on 22/11/08 at 12:11 PM |
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quote:
Originally posted by JoelP
this has been on my mind too recently as i need to make a VERY bright torch. I was torn between a non-roadlegal 100w headlight bulb running off a car
battery, or maybe a zenon bulb.
No idea about efficiency though!
not a very portable torch Joel if its running on a car battery!
Reminds me of the first 'mobile' phones!
ATB
Locoboy
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