My MH are about 7" above the water and give off a cool " shimmer " which you wont get from PC's ... I installed a 120V 6" fan to cool mine but then again I am running 4 X 400W bulbs so YMMV depending on wattage and number of bulbs used
Cheers
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Steve
“The most important decision you make is to be in a good mood.”
― Voltaire
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