Lighting your enclosure.
For optimal basking, without risk of burns, it is common practice to use a cluster of three smaller 45 to 50 watt halogen flood lights rather than one big light. Experienced keepers use common floodlight bulbs sold at most retailers / hardware stores for use in outdoor security lights. They cost a lot less than reptile bulbs sold at pet shops, and work just as well.
Optimal basking temperatures should be right around 130-155 degrees (F) and be broad enough to cover most of the lizards body while sprawled out under the lamps. Warning! the use of a single high wattage lamp will burn your lizard and dry out the air in your cage.
It is also of no harm and thought to benefit the lizard if there is at least one UVB lamp in use to enhance the simulation of sunlight.