All my tanks with MH have been " in wall " so I just locate the ballast out of the way on X-10 timers and the rig the reflector with 5" L bracket and attach the mogul base to that ... the rule of thumb for MH is each lamp can cover 2 sq ft and anything deeper than 24" should have 400W bulb/ballast
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Steve
“The most important decision you make is to be in a good mood.”
― Voltaire
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