How far do you kepp your MH's from the tank? 6-8-10-or 12 in

[petpoor]

Mine are about 8" from the surface of the water.

 

[naesco]

8 and one half inches

 

[danmhippo]

I have no canopy, I hang mine up like a pendant. 18"

 

[srbayless]

Howdy,

In my premade hood, they are about 8" above the water, maybe a little less. There is an acrylic sheild on that hood so I don't worry about splashing. I keep the bulbs 10" above the water in the hood I made.

Good luck,

Scott.

 

[Josh's Reef]

I'm setting mine up just wanted to know the general consencus.400w.

 

[Len]

about 10.

 

[North Bay 101]

Mine is 8" from the water. It is a 400 Watt verticle pendant.

 

[whirley]

8" Horizontal 250 watt HM.

 

[reefland]

I keep my 250w halides 5 inches from the water. No splash shield.

 

[geofloors]

250w. about 15" above water surface

 

[Jon_Hewett_85]

250 watt 3.5 inches...400w 6 inches

 

[Jon_Hewett_85]

250 watt 3.5 inches...400w 6 inches

 

[Toadally1]

400 watter, 11 inches

 

[vp39]

For MH's you canopy should be 14" from top of tank to inside of top.This will allow for heat not to transfer that easy to the tank.
Glenn

 

[Lunchbucket]

wish i had MH's

sad me
Lunchbucket

 

[jimbo]

250W Horizontal Pendant, 6". W/ glass shield.

 

[myreef]

My canopy is 13" tall and the halides are about 9-10" above the surface. I do have an acrylic shield over my halides so splash is not a factor.

 

[npaden]

I currently have my 400W MH about 7 to 8 inches above the water. On my new tank I'm going to drop that to around 4 to 6 inches depending on the final hood design. Most MH bulbs have splash/uv shields already and shouldn't be adversely affected by a little spray. Several people keep thier MH bulbs as close as 3" above the water.
FWIW, Nathan

 

[wdt2000]

I want to install 400 watt MHs to replace my 175's. My problem is that my hood is designed so that the bulbs only sit 3.5-4" off the center brace. What could I do to make sure the center brace does not crack? Or should I just build a new hood? This is a 200 gallon Oceanic.

Thanks
Will

 

[Mac1]

About 3-4 inches, depending on where you measure (they hang downward slightly in their sockets). It's a narrow hood. Given my druther's, I'd have them higher. As they are now, I HAVE to have splash guards (bulbs are too expensive to replace), and I would really like to get those out of there. In a new setup, I would mount the bulbs higher, say 6-8 inches (firmly, no drooping this time), and not run splashguards.

- Mac