I use to lamps but one is a mercury vapor bulb for uvb and heat and one is a 250 watt ceramic heat imitter, I'd scrap the florescent bulb, my torts love the mercury vapor bulbs, they seam to be more active and healthier.
keep in mind though the bulbs I use cannot be set on top of the screen mine suspend over the table. and I use a thermostat on the ceramic so it is not useualy on when the merc. bulb is on. they switch on and off at night on timers.