Unfortunately I don't have enough electricity in the room right now to run it while the lights are on, but I can really keep my relative humidity in check with lights on anyhow. For a few reasons, the d/h has to be in the room. But, actually last night my lights on temps were over 80 degrees, while my lights off temps were around 76. I think we are just getting over a very big cold front here, and my temps are about to rise on both lights on and lights off periods. I will keep an eye on it.

Hagbard~ I don't believe having the d/h on for every 15 minutes out of the hour will bring my r/h down quite as far as I'm looking for... but I could always experiment. With no exhaust fan on during lights off cycle, the heat won't escape too too quick, but I can toy around with things... thanks all