yea like 2 inches man. the closer the better. like stilltokin said, put your hand right above your plant and if u feel heat then the light is too close.
Inch and a half seems fine if the lights are stable. I would think even at a room temp of 90 it won't make the lights much hotter to plants. A fan really helps though and doesn't have to be too strong to make a difference.
my vey room is around 90 - 95 all the time, i have my cfl 1/2 - 1 inch away from my plants, but i have a fan blowing at my bulbs, so that stop's any burning