The Exo Terra 35 watt SunRay is an ultra-versatile metal halide bulb that combines powerful light output and infrared heat radiation with optimal levels of UVA and UVB. It delivers a uniform spectrum that replicates natural sunlight to promote the general well-being of your reptiles. The combination of UVB and heat enables your reptile to generate its own Vitamin D3. This facilitates the absorption of calcium, while helping to prevent the onset of metabolic disorders such as Metabolic Bone Disease (MBD). The SunRay's brilliant light output and balanced UV rays stimulate appetite and breeding behaviors, while improving the physiological health of reptiles. Its aluminum facetted reflector produces an evenly distributed light beam. Aluminum also provides superior heat dissipation resulting in an extended lifespan and more stable operation. Designed for use with the Exo Terra SunRay Metal Halide Fixture.