2 Pack Of Zilla Incandescent Bulb, 50W Each Heavy duty filaments keep Zilla's reptile basking lights brighter longer. Full spectrum lighting enhances natural colors of your pet reptile and his environment. Creates a natural environment that keeps pet reptiles healthy and happy by simulating the daytime sun. Provides light and heat that encourages reptiles to engage in natural basking behaviors and regulate their body temperature. The bulb simulates the natural daytime photo-environment of a desert or tropical habitat while providing a heat source needed for a healthy reptile environment. Photons from the daylight bulb pass through the glass heating the opposing surface allowing the reptile to bask in its warmth. The bulb is made from glass containing rare earth neodymium phosphors to 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.