Light Height.

[reeferkeeper420]

Just wondering how high 4×54t5s should be hung above a 7"deep tank.

 

[TORX]

Just wondering how high 4×54t5s should be hung above a 7"deep tank.

24" at least.

 

[chrisstevens]

Also interested.

 

[heath]

I have always been told that the general rule of thumb is; the shallower the tank the higher the light...

 

[reeferkeeper420]

It would also depend on whats in the tank aswell..sps you would obviously have it closer. Right now mines at about 12-14".

 

[Sewerat]

Water depth changes how your light will refract. Yes depending on coral requirements light height is a factor. But generally we speak that of a standard depth tank, not a 7" deep water tray. Do any search on any brand light and most will have a picture that demonstrates light penetration at depth. This is why those people running 30" tall tanks need a 2g light, just to put enough light to get to the bottom.

For example


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[scubasteve]

put it this way my 90 gal has lights about 18" above and its around 24" deep. on my frag tank that is 6" deep with my ai sol (led) on the same setting as the 90 gal its about 30" away from surface and everything from sps to zoos seem to like it.

 

[reeferkeeper420]

Hmm ive had so many different answers, now im just confused lol

 

[David Caplan]

My 6" deep frag tank has a radion 12" above it and is fine. My 18" deep display has the lights 12" above. I am using wide angle lenses on both. The fixed mounting arms by ecotech for the radion put the fixtures 12" above the tank.

 

[heath]

not sure why, most of the answers were pretty close to being the same...what is in the tank and what kind of lights are you using...

 

[Thanh]

I think 12-14 inches is fine. I have the same fixture. Hanging about 12 inches on top of my 24x18x7 frags tank and corals are loving it or you can hang it higher and lowering the fixture down about an inch every two week.