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View Full Version : 400W Metal Halide - How high from water?


klesher
03/26/2010, 06:28 PM
I am having a canopy custom made for my 400W MH/T5 combo unit. How high should I have my fabricator construct the canopy to help avoid heat problems in the tank? I'd prefer not to have to buy a chiller.

Thanks

mike_cmu04
03/26/2010, 06:44 PM
At least 8" but it is still going to really heat up your water you will have to have a few fans then still you will probably need a chiller. 400 watt puts out a ton of heat

slicedsmoke
03/26/2010, 07:13 PM
I have my 250w metal halides 13" from the water and it raises my temp 2 to 3 degrees at least.

klesher
03/26/2010, 07:14 PM
What do I have to do to avoid the chiller? The tank is 30" deep which is why I went with the 400W.

slicedsmoke
03/26/2010, 09:04 PM
keep the house cooler and run the halides not as long is my guess.

jbird69
03/26/2010, 10:55 PM
Small fans blowing thru the canopy and across the water surface makes a HUGE difference

brycerb
03/27/2010, 07:08 AM
I run my halides without a hood just to keep temps down.

iap
03/27/2010, 10:09 AM
My tank is 32 deep. I have my lights about 10 inches off the water. It was raising my temp about 4 degrees. Then I went and got 2 little fans, lowered my temp quick.