Nice temps man, I bet you get some great color. I run mid 70's light on, mid 50's at night, and usually get some pretty nice purple/reds. Strain dependent of course.You want the cold. Why? It makes your buds denser, it hardens off your plant, more aromatics. More color. Take the heater out of there bro. Let the lights heat the room in the light cycle. Watch the temp when the lights are off 28-f will kill them over a period of time, but you can go low bro into the mid 40's is just fine. I run 48-f lights off and around low 70's with the lights on.