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light question?

Discussion in 'General Plant Topics' started by hani, Jun 1, 2009.

  1. hani

    hani Lifetime Charter Member
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    am about to set an office tank, 75 g, 41w x 24.5H X 17.5 D, the tank comes with 2 T5 HO 39W EACH tube total 78w , so i bought another light fixture same set up make the total 156 w, am thinking to get a third one to make it 234w wich will give 3watt / gallon.
    the tank is 24.5 inch H and the T5 are 36inch w 5 inch shorter than the tank.
    should i get the third light fixture, or should i stay at 2w/g mark
    co2 will be used
    thanks
     
  2. Gerryd

    Gerryd Plant Guru Team
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    Hi Hani,

    I would only use MAYBE the second fixture.....

    Remember that more light requires more c02/ferts..

    It may be harder to keep c02 demand steady for 3 wpg....

    Try it with just the original fixture first and see how it works for a bit..

    You can ALWAYS ADD more light, is harder to remove it........
     
  3. hani

    hani Lifetime Charter Member
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    thanks Gerryd,
    The reason am thinking to add another light bc of the tank H, which is 24.5 in.
    At home am running 29g tank with 2x55 wt, i have both lights on at the same time for 2 h at noon , and the rest of the day with only one .
    i was thinking doing the same except at home am using AH light system, not T5.
    The original fixture will give 1 w/g which seems too low.
    hmmm, dont know..
    thanks
     
  4. JDowns

    JDowns Lifetime Charter Member
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    I agree with Gerry. The second light fixture at 156w should be more than enough light. I have a 24" tall tank and run 240w, 3 x 80w bulbs 16" off the waters surface and have no problems growing any stem out there.
     
  5. Tom Barr

    Tom Barr Founder
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    I have 1.8 W of T5's on a 120 Gal and it's 24" deep + 8 inches above the tank, plenty of light to grow any species you want...........

    Regards,
    Tom Barr
     
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