The Repti Basking Spot Lamps have a unique patented double reflector that focuses 35% more heat and light into a tight beam. Ideal for use with diurnal reptiles that thermo-regulate by basking, including many tropical and desert species. The ultimate Basking Light for all types of reptiles. Patented computer designed Double Reflector focuses 35% More light/heat in the beam than other reflector bulbs. Tighter beam creates a more effective Basking Site than ordinary reflector bulbs. Increases the overall ambient (inside) air temperature of your terrarium. Especially helpful for all tropical and desert species, i.e. Iguanas, Bearded Dragons, etc.