The Ceramic Heat Emitter is a great way to add some warmth to your home during the cold months. These bulbs are made of high-quality ceramic and are designed to last for up to 10,000 hours. They are also resistant to humidity, making them perfect for use in humid environments like a terrarium or aquarium. With a diameter of 3.35 inches, these bulbs are also large and can accommodate most reptiles, birds, and small animals.