The ultimate basking light for all types of Reptiles, patented computer designed double reflector focuses 35% more light/heat into the beam than other reflector bulbs Tighter beam creates a more effective basking site than ordinary reflector bulbs Increases the overall ambient air temperature of your terrarium. Especially helpful for all tropical and desert species, i. E. Iguanas, bearded dragons, ect. Lasts up to 2000 hours 2 pack value pack! Includes a 5 point Pro-Tip Guide affixed to the back of the packaging!