Okay the temperature fluctuates here from 30s at night to 70-80s during the day. I have a 250 watt bulb floating over a 4'1/2" x 4'1/2" box, this morning at dawn is was around 95.... then by 3pm it maxed out at 110......... I have it over the center of the box right now and figure the outskirts must be closer to 90..... so do I leave it alone? Is it better for it to chance getting too warm or too cold? Help? Update - the temp ranged last night from 100 just below the light to around 50 at the edge, so that should be plenty of range right? or is that too much in case someone forgets to go back toward the center at night?