i run 6 x 39W T5 Giesemann Midday bulbs on my 65 gallon and love it. however my setup is DIY, but i do use individual reflectors for my lamps, and i get a LOT of light. of course i only had all 6 on for an hour or so for a burst. i went with T5's over MH's because of practicality and cost of replacement bulbs, as well, heat was an issue for me also.another confirmation! so has anyone run a 75g on 6x54 t5HO?