I'm sorry Jack but I do not have too much experience with this. What I can tell you is that I just upgraded my PC's to MH's (With the pc's as supplemental lighting). the first couple of days, temp and algae were issues. I have cut back the photoperiod by two hours on the MH's, and reconfigured my fans. I have had no problems since and intend to gradually increase the period over the next two weeks.
HTH until someone with more concrete experience comes along!
Rob
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