I have set up a plant stand with 3 banks (4 tubes over 24" shelf) of lights in my basement. During the day (when the lights are on) the temperature goes to 24 C (75 F) but at night the area drops to 15 C (59 F). So far my success has not been that great but I wondered how big a factor this temperature range would have on my success or should I be looking at other factors. The lights are on from 6am to 8 pm.