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Deweys Dad
06/26/2006, 07:14 PM
My 90gal came with a canopy that is too low to install my MHs so I'm going to be building a new one. What should be the installed height of the bulbs above the water? If it matters, they will be dual 175s or 250s and the tank is 24" deep.

pheel
06/26/2006, 07:57 PM
mine are at 12", some may find it a little high but I don't have to clean the bulbs or the reflectors. Most people have around 8 inches.

I have 2X175 over a 90G

MeuserReef
06/26/2006, 08:00 PM
Sorry to Hijack.... but what would you all say would be the absolute minimum height for 150W halides?

pheel
06/26/2006, 08:09 PM
I don't think there is an absolute minimum, but if you put them at 3 inches you might have to clean them very often. 150 DE have protective shield, but I've heard of SE bulb that exploded because of splashing water.

mg426
06/26/2006, 08:17 PM
I have 250 and 175 XMS @8 inches. No problems at all

xtrstangx
06/26/2006, 09:22 PM
I'd go with 250w for your tank, btw.

I run my MH at 9".

stewie24
06/27/2006, 05:21 AM
I run my dual 175 watters over my 55 gallon about 7 inches from the surface. No heat problems or any other problems at all.
Stewie

smcdonn
06/27/2006, 09:40 AM
I run dual 250's over my 75 at about 8" off the water

scarter
06/27/2006, 09:42 AM
400w at 14 in