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Thread: Saltwater aquarium Lighting

  1. #1
    Copepod
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    Saltwater aquarium Lighting

    Ok i was wondering on my 90 gallon saltwater tank i have 4 54watt t5 with 2 250 watt hqi metal helide. its a whole fixture

    now on other tanks they look darker with more lighting and i was wondering why

    My tank looks awsome but i want a little more darker lighting

    what do i do change the bulbs change light fixture

  2. #2
    copod
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    Darker??? Meaning higher Kelvin temp??? What is the K rating on your MH bulb ??? If not 20K but 10-14-15K then try replacing with 20K first or have all T-5 lamps be Actinic...

    Cheers, Todd

  3. #3
    Blenny
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    the higher Kalvin or k rating the bluer the spectrum. one would assume that this is what you are talking of. and i agree with Todd, get a some higher K bulbs. don't go too overboard on the 20k bulbs. the lower K is what plants and corals use to grow. the higher k is what will bring out color.
    180g display; 55g seahorse tank; 25g sump

  4. #4
    Clownfish

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    Actually most corals actually use light in the 410-475nm range, which is the blue spectrum.

    Are your bulbs SE or DE? 20k radiums and 14k phoenix's are popular blue looking bulbs in SE. I am pretty sure phoenix makes a 14k DE too.

    What T5's are you using?

  5. #5
    Copepod
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    i have 4 t5 2 daylight and 2 atinic
    my metal halide are 15k hqi de 250 watt

  6. #6
    SKIM FU
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    The man wants a bluer tank! (much cooler, imo)
    german made Giesemann bulbs all around FTW!!!!

    hqi:
    20K-250DE-G Premium Aquatics - 20K-250DE-G Aquarium Supplies

    t5:
    SL-531010 Premium Aquatics - SL-531010 Aquarium Supplies

    and FWIW, that is the exact combo i would use myself.


    dont get too wraped up in what manufacturers say about the color of their M.H. bulbs, there is no industry standard, merely their own interpetation.
    Last edited by Skimmy; 07-19-2012 at 07:24 PM.
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