in my experience with flexariums (thats all i use) if the actual bulb is NOT touching the mesh and there is a space between the bulb and the mesh there should not be any problems, i have been doing it for over a year and no problems, to be safe tho i just use normal household bulbs as heat lamps, there better for the cham and cheaper for you, they also dont get as hot, just try a few different bulbs (40,60,100w) to find the temp you want the basking spot to be at, and there you go!!!