Lumens Vs Spectrum

Discussion in 'Advanced Marijuana Cultivation' started by RickWhite, Jan 30, 2010.


    PhenoMenal Well-Known Member

    Anyone have any thoughts on the spectrum that's output by the Samsung LM561C's white light LEDs used on quantum boards? [​IMG]
    They have 2700k, 3000k, 3500k, 4000k, 5000k, 5700k, and 6500k, and output an impressive 200 lumens/watt - i think only Samsung's LM301B's which were announced mid-2017 beat them in that regard at 220 lumens/watt [Samsung news link].

    The theoretical max for "a white LED with phosphorescence color mixing" is 260–300 lumens/watt [physorg src]. Fascinating tech race to a finish-line established by physics :)

    Quite stunning efficiency when compared to other well-known lights [img src]:
    ps. ^ Good thing incandescent lightbulbs are being banned/phased out in many countries.

    Anyway here's the 3000k and 6500k from the [LM561C datasheet]:

    There's also very little infra-red above 700, so not much in the way of heat, and because they're outputting so many lumens per watt there isn't much being wasted as heat either, which i guess explains why most are just passively (and silently) cooled with heatsinks instead of active noisy fans, i'm guessing bedroom growers will no doubt appreciate the extra quietness
    Last edited: Jan 31, 2018

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