Hey, all. I have a 50w blacklight bulb & a 75w blue bulb (both by Zilla). I've read countless times that an infrared is the way to go. My 20 long isn't set up at all, yet. Just planning ahead. Dimmer is picked out, already--> http://www.homedepot.com/h_d1/N-5yc1...2#BVRRWidgetID Due to the ever increasing cost of heating our apt., we keep winter temps around 68-70 degrees. So, would a 75w Infrared bulb on the above dimmer be my best choice? Also, my dome fixture is 8.5" wide. Maybe a smaller 5.5" would be more suitable? Thanks for reading/responding!