Screw Cap Metal Halide Pet care lamps are available in, E27 ES screw cap and E40 GES Giant Screw Cap and wattages 150W, 175W, 250W, 400W and 1000W. These are specifically designed to enhance the comfort of fish in aquariums and reptiles in terrariums. Reptile lamps are designed to emit levels of UVB which promotes healthy bone development as UVB is needed by the reptile. With a quality product ranges from BLV and Iwasaki there are plenty of options available to ensure your pets maintain a comfortable happy life.