Right, we need to know exactly what type of light it is. Look on the bulb, either on the ends or the top for any info printed on the glass.
A tube fluorescent (Vitalite, Growlite, ReptiSun 5.0, etc) shouldn't be harmful. They are not THAT intense. An incandescent house light bulb, a heat spot light, or "basking bulb" could cause burns if he gets too close for too long. Ironically, chams don't have very good heat sensors in their skin and can be burned. A compact fluorescent (coil bulb) could damage his vision depending on what type of bulb it is.