MH question

Possibly. Your chances would be better with no hood and a cool ambient room temp say maybe in a basement. I run a 120 with 2-250 halides in my basement and my heater does occasionally comes on. It greatly depends on how the lights are mounted.
 
they would be mounted on a hood. i have been debating on getting MH/T5HO or LED/T5HO just know that MH has some amazing growth and color for sps dom tank
 
I have 2 250 and two hydras over a rimless. No chiller, however if I keep the house at 76 or higher, the controller will start shutting down lights after about 6 or 7 hrs
 
I also run a 120g with 2x250w MH with no heat issues and have also run a 75g with 2x250w MH in the past with no issues but did use a fan on a controller. Benefit of being in a dry climate. Evaporative cooling is your friend and can really remove heat from a tank.
 
Mine is topless. I suspect if I had a hood my situation would be worse, although I think I could get by without a chiller by fans and adjusting run times
 
i have a 75 with 2X 175W MH and 2 T5s over it without a chiller. dont have a hood over mine and the tank temp stays constant at 79.5-80.5.
 
so basically i would have to go with led because i have no way to hang lights above my tank otherwise. thanks for the input everyone
 
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