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Light Calculator questionable?

Discussion in 'Rotala Butterfly Support & Feedback Forum' started by tiger15, Aug 12, 2017.

  1. tiger15

    tiger15 Member

    Aug 12, 2017
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    Local Time:
    3:54 AM
    The form looks good. The hard part is to solicit people to submit the data.
  2. Mittens

    Mittens New Member

    Sep 21, 2017
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    Local Time:
    4:54 AM
    So am I understanding this correctly?

    The calculator says that 12 x 5W Cree LEDs (I'm using Cree-XP-g2 to be specific) should be 10" above a 48wx12lx13h tank with 4" substrate to give me a PAR of 55.


    However, the calculator assumes all these LEDs are on the same strip across the tank.

    Given that 6 lights suspended 5" above this tank would give me similar PAR (according to this calculator)...

    If I divide my lights between two fixtures @ 6 lights/rail, then I can space the fixtures so I have about 6" between the front lights and the back lights, at a height of 5" above the tank. This should give me some adequate level of "high" light that would be manageable with pressurized CO2 and minor dimming/raising to account for the overlapping light?
  3. fablau

    Staff Member Moderator

    Sep 13, 2008
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    Local Time:
    12:54 AM
    Yes, I think so Mittens. I think that by doing what you are suggesting you should get around 100 PAR at the substrate. The calculator is not too far from that.

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