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Old 06-27-2015, 02:05 PM   #11
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Yea, 2 would give you complete coverage at any height off the water surface.
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Old 06-28-2015, 02:07 PM   #12
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Yeah tank is 3ft long


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Old 06-28-2015, 02:22 PM   #13
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I have a similar type of light, a GalaxyHydro unit, on my 50 gallon-36"x15"x20", the light is approximately 10"-11" above the water surface and I get complete coverage.
2 would be overkill on a 36" tank unless it is like 24" wide.
I'm currently running mine at 35% white/60% blue and all my corals seem to be happy.

The only caveat is I get a little "spotlight" effect from the red & green LEDs, but removing the lenses as Mr. X mentioned would allieviate that, I just haven't gotten around to it yet...LOL
or I could raise it another 6".


In short, one of those 165 watt units is the best bang for your buck you will currently find.
I know because I spent two months researching before coming to that conclusion.
They are definitely powerful enough with the proper spectrum to allow you to keep any type of coral you want.


If you are set on getting a strip type of light, one with the same power will cost you 3-4 times as much.
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Old 06-29-2015, 02:41 PM   #14
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Sorry the tank is 39" long 17" high and 15" deep


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Old 06-29-2015, 02:45 PM   #15
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And no i dont mind what type really just trying to get best light for as little money really. And thought in the long run the led option would be best
Cheers for all your help on this guys


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Old 06-29-2015, 07:21 PM   #16
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I would use 2 fixtures for even coverage.
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Old 06-29-2015, 07:54 PM   #17
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Quote:
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I would use 2 fixtures for even coverage.
My tank is essentially the same dimensions, only deeper and one fixture is plenty and I don't notice that uneven of coverage whatsoever.

I do have mine mounted in a canopy so it is reflecting back into the tank any wasted light, so I will admit that in itself does broadcast more light into the entire tank.

but I still think one light would be enough.
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Old 06-29-2015, 07:56 PM   #18
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39" though....They are under a hundred a piece...plus, you could turn them down.
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Old 06-29-2015, 08:22 PM   #19
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39" though....They are under a hundred a piece...plus, you could turn them down.
1.5 inches on either end isn't gonna make any major difference, plus I'm guessing it's a glass tank and that is the measurement including the frame, so actual useable internal dimension is most likely ~36"

sure you can turn them down, which also means you can turn them up.
What is the point of buying two fixtures if you have to run them at a very low level whenever 1 fixture can do the same job running slightly higher.

sounds like waste of $$$$ to me.
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Old 06-29-2015, 09:29 PM   #20
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It's not really the same. The outer edges will not be as potent as directly under the fixture. Even coverage will give you more placement options. Unless you are saying that you are growing sps just fine on the outer edges of your tank. Then it may be a waste of money to get 2.
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