View Full Version : MH Light Height
ShipOFools
01/16/2008, 08:14 PM
Hey now just wondering if there is a rule of thumb for the height above your tank for mh light?
Colin
01/17/2008, 07:15 AM
Everyone will say 8 inches, but you can go lower. The biggest issues with low placement are temperature (not that big a deal, my low MH is cooler than the VHO's I replaced) and light spread. A higher placement lights up more area, while a lower placement concentrates more light in the center.
You definitely want to have it high enough that it won't get splashed.
--Colin
WarrenG
01/17/2008, 10:37 AM
A 6" difference in height will affect the intensity of the light that hits the surface by about 50-60%.
Mine's 10" above the water line. Anything lower and my chiller starts screaming.. ;)
There is no 'rule of thumb' that I know of when it comes to MH distance to the water.
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