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The virtues of under-driving leds

Discussion in 'General Electronics Discussion' started by oz93666, Sep 8, 2015.

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  1. oz93666


    Dec 7, 2014
    Component (chip) led s are fairly cheap now ($4/100W , ebay) so it makes good sense to under-drive them.

    Driven at 25% rated power they are around 20% more efficient(lumens output/Watt) , the saving in electricity over a lifetime will more than pay for the extra cost of extra chips.

    Also, a lest costly heat sink is required , if any,.... and leds have a much longer life expectancy if run cool.
  2. Colin Mitchell

    Colin Mitchell

    Aug 31, 2014
    25% of rated current is a bit too low.
  3. oz93666


    Dec 7, 2014
    A bit too low for what ?

    You obviously need more chips to get the same light output.

    I thing the gain in efficiency is closer to 30%... So lets say you need 10,000 lumen of light , you can either use one 100w chip and drive it at recommended max. or use 3 driven at 25W the light output is the same but you only use 75W instead of 100W, with the same heatsink life expectancy is 2 or 3 times longer , because of cool operation temp.
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