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How do you get 220 lumens on a 800ma draw?

  • kimgkimg Monday, December 29, 2008 10:20 AM Reply
    Does this make sense? Have we had a jump in LED efficiencies recently?
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  • Retrop Monday, December 29, 2008 10:24 AM Reply
    With your imagination. duh.
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  • isotco Top 10 Forum Poster Monday, December 29, 2008 10:25 AM Reply
    800mA output : ) It probably draws 2.5A from a NiMH battery.

    And as always, the lumen output is always overrated.
    Stay a while and listen!
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  • sic22 Monday, December 29, 2008 3:45 PM Reply
    800mA output, not current draw! So @0,8A to the LED 220 emitter lumens is possible from Cree Q5.
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  • matrix-neo Moderator Tuesday, December 30, 2008 6:53 AM Reply
    '800mA Total Current Output, Digitally ' would suggest thats the driver output right?
    the Q5 would happily run on .8A, but i always thought it needs 1A+ to put out over 200lm, but its a smaller light it would get too hot
    Resistance is futile-give in to DX gadget craving!
    also a voluntary mod-be nice please!
    Have an enquiry? https://cs.dx.com/ticket/index

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  • frills Top 10 Forum Poster Tuesday, December 30, 2008 9:57 AM Reply
    Manufacturers tend to list the diode's maximum output regardless of how it's driven. Rest assured, this light will not put out 220lm.
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  • Sparrowhawk Wednesday, December 31, 2008 9:05 AM Reply
    So how much is it likely to put out in reality?
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  • tralewolf Wednesday, December 31, 2008 3:34 PM Reply
    The CREE data sheet doesn't give any specific numbers at anything other than 350mA drive current but there is a chart that shows relative intensity (relative luminous flux %) vs. current (at 25deg C). At 800mA the line is about 180 lumens. It doesn't reach 220 until about 1000mA.
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  • Retrop Wednesday, December 31, 2008 5:03 PM Reply
    If that thing makes 180 lumens, even with a 14500 battery, I would be blown away. The best Fenix can do right now with a AA is 120 lumen constant output for an hour and a half (the new LD10). If this light is brighter than that, I'm gettin' it.
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  • tralewolf Wednesday, December 31, 2008 10:56 PM Reply
    Of course, the 180 number is from the data sheet so the reflector, lens, battery, and other factors will affect actual lumens out the front.
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