Why will my fluorescent light not come on when it is warm in the room?
Is this a cfl or tube fluorescent bulb? And to be honest i have never heard of this. I do know some older t12 bulbs with magnetic ballasts fail to operate at low temperatures roughly 32 degrees F. They should work better at warmer temperatures. I know with newer t12 bulbs that have electronic ballasts operate at lower temperatures than magnetic ballasts as well as t8 and t5 bulbs due to their electronic ballast. Cfls operate roughly the same was as electronic ballasts. You shouldnt have to turn ur bulb to have it light up. It could possibly be a bad bulb. Have you tried a different bulb in the same fixture to see if it is just the bulb?