Zilla Ceramic Heat Emitter for Combo Domes & Strip Fixtures provides 75 watts of penetrating heat needed by cold-blooded reptiles. Zero light emission is perfect for day or night. If reptiles could talk, they would heartily endorse the satisfying heat output of Zilla Ceramic Heat Emitters. It's a heat which warms the pet rather than the terrarium, and leads to a higher level of activity and greater all-around health. The emitter generates no residual light, so it won't interrupt sleep patterns. The durable ceramic design outperforms incandescent and halogen heat bulbs in both heat output and working life. A tough ceramic shell protects pets and owners from accidental breakage. For use with Zilla Halogen/Fluorescent Combo Domes and Fixtures.