Day White Light Incandescent Spot Bulbs. Provides focused lighting and heat source ideal for reptile basking areas Simulates the natural daytime photo-environment of the reptile s habitat* The bulb simulates the natural photo-environment of a desert or tropical habitat while generating a heat source needed for a healthy reptile environment. Photons from the daylight spot bulb provides a focused beam of heat and light that pass through the glass heating the opposing surface creating a direct basking spot for reptile. The bulb is made from glass containing rare earth neodymium phosphors produce a brighter whiter light. This full-spectrum lamp emits energy across all visible wavelengths from 400nm to 700nm and UVA rays from 315nm to 400nm. *For UVB output use Zilla Desert 50 and Tropical 25 UVB Fluorescent bulbsThis Product/Package Measures: 3.25 in. L x3.25 in W x4.50 in D