This light fixture features a porcelain insulated socket, heavy gauge metal guard, and a strong clamp with a rubber grip for added security. The wire cage will not retain heat like an aluminum dome fixture would, which makes this a great fixture to use in large reptile cages for iguanas, snakes, lizards, tortoises and more! Can be used with mercury vapor bulbs, incandescent heat lamps, halogen bulbs and ceramic heat emitters up to 150 watts. U.L. certified with Zoo Med ceramic heat emitters!