Zilla? Incandescent Spot bulbs pinpoint light and heat in a focused area for a more dramatic visual effect and concentrated basking place for your reptile. Spot heat lamps create basking and warm zones, allowing reptiles to move away from the heat source as their body temperature changes. Heavy-duty filaments yield more hours of service from every bulb. Provides more focused beam of light for a perfect basking spot and warm side of the terrarium|Pinpointed light and heat allows reptiles to easily move away from the heat source and regulate their body temperatures|Heavy-duty filaments yield hours of performance|Recommended for use with Zilla Reflector Domes