400w Metal Halide Coverage Question

Lousybreed

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I am designing my next tank. It’s going to be a big boy tank. I am wondering for a SPS heavy tank what is the recommended coverage when using a 20” large reflector like lumen brights and mounted about 16” above the tank. My tank will be a LED and metal halide combination. I was thinking 36” coverage per fixture?
 

ElussssvReefSD

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I am designing my next tank. It’s going to be a big boy tank. I am wondering for a SPS heavy tank what is the recommended coverage when using a 20” large reflector like lumen brights and mounted about 16” above the tank. My tank will be a LED and metal halide combination. I was thinking 36” coverage per fixture?
I would also like to the know the answer to this question... Because I got 3 of those bad boys that arrived today and am trying to decide how high to hang them above the tank:

IMG-1130.JPG
 

naterealbig

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Not certain of the exact coverage, but I will offer a reference. My Giesemann Spectra (with much smaller reflectors, and a 250w bulbs) blanket covers my 48"x38" display at 15" above water line. You will get 40"+ coverage with a 400w with a large quality reflector.
 

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jda

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Get a meter and raise and lower the fixture until you like the PAR. Those 20" reflectors will spread very well whether you have them an inch off the surface or up a foot or more. I used to use one to cover 36x36 and I had it like 3" off the water for no spill and max PAR.
 
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Lousybreed

Lousybreed

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Thanks guys. I was asking for my future build, I don’t have a fixture to play with, just trying to estimate how many I will need.
 

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