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Thread: interesting read about fuge bulbs...

  1. #11

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    1/5th? Really!? That would be cool but it seems fairly low. It would be awesome however. Can anyone else confirm 1/5th red LED to t5ho? That would make LED very cost effective if that's all it really takes to match standard lighting.

  2. #12
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    That seems about right to me from my testing.

    4x 3w OSRAM 660nm, run @ 700mA, takes up 2.1w per LED, so 8.4w of red LEDs grows more than a 42w 2700k CFL, both run on the same size screen (10"x12"), both run on the same 12/12 light schedule.

    4 660nm LEDs is bare minimum to slightly exceed the growth of a 42w CFL, I run 6 reds and a blue on each side of mine and I easily get 5x more growth but at 1/3rd the power, not 1/5th.

    In regards to T5HOs, I haven't personally tested them, but I would suspect the same 1/5th rule would hold true. Normal fixture is 2x 24w, so 48w of T5HO, if you spaced 5 Osram LEDs in a 20" row I would take a guess and say it could match the growth for 1/5th the power, but if it were me I would use 7 660nm LEDs per side on a SM100 type scrubber, 14 LEDs total which runs fine on a cheap $16 meanwell LPC-35-700 driver.

  3. #13

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    I'm a fan of 1w LED usage. other than the extra wiring, its always made more sense to me. semi dependent on distance of course... I like the more even coverage. The spotlighting, not just visual but intensity and you usually wind up with more lumens per watt with 1w LED...which is important because I generally use cheap LED.
    I got a bag full of these driver that'll run 3 1w LED. If you go ebay and use 630nm your looking at about $1 per LED including driver. Not the highest output LED in the world but they are pretty cheap. If you run 660nm probably closer to 2$ per led driven.

  4. #14
    kerry's Avatar
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    I am running only 22% of what I did with my CFL so, Yes the 1/5th is in the range I have found to work.
    150G. Reef/Mix
    125G. 3 Regular Oscars/1 Jack Dempsey
    75G. 20+ Africans
    40G. Fish/Reef. Algae Scrubbers on ALL my SW
    10G. SW Fish/Reef.
    10G. SW Hospital/new fish quarantine/pod breeder tank
    6 stage RO/DI system 200 GPD.

  5. #15
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    Wow. 1/5. I'm trashing my T5HO scrubber ASAP.

  6. #16
    kerry's Avatar
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    I cant remember the exact watts my LED's are taking, I know its not the full 3 Watts they advertise, seems like it was closer to 2 or 2.5 Watts. I am going to put 4 660nm on each side of my 6x6 screen very shortly and feel that its going to be plenty. With my little 1 cube scrubber I am running 2 660nm on each side and it seems just about right so maybe its not quite a fifth on a smaller screen that is more rectangular then square, this screen is 2.75"x 4.5". A 3.5"x3.5" screen would more then likely need only one on each side.
    150G. Reef/Mix
    125G. 3 Regular Oscars/1 Jack Dempsey
    75G. 20+ Africans
    40G. Fish/Reef. Algae Scrubbers on ALL my SW
    10G. SW Fish/Reef.
    10G. SW Hospital/new fish quarantine/pod breeder tank
    6 stage RO/DI system 200 GPD.

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