Zoo Med Aquatic Turtle UVB Heat Lighting Combo includes a Mini Combo Deep Dome Lamp Fixture, Turtle Tuff Halogen Lamp and a 13 W Reptisun 5.0 UVB Mini Compact Fluorescent Lamp. The Mini Combo Deep Dome Lamp Fixture is a dual fixture which allows the two bulbs to work in unison. The fixture itself is made of polished aluminum, for maximum light and heat output. The extralong reflector dome extends beyond the face of the lamp, which prevents the bulbs from sticking out. The dual ceramic sockets can be used with lamps up to 100 watts. Turtle Tuff 50w Blubs are heavy duty, splash proof halogen lamps. This lamp acts as a heat source for aquatic turtles, or other water based terrarium animals. This long lasting bulb lasts for an average of 2500 hours The ReptiSun 5.0 Mini is a 13 W bulb is ideal for tropical reptiles and amphibians. The special UVB transmitting quartz glass grants maximum UVB penetration. The cool burning mini compact fluorescent bulb screws into standard threaded sockets, which eliminates the need for a separate ballast. UVB emissions help prevent or reverse metabolic bone disease and UVA increases feeding, mating, and other natural behaviors. Includes Mini Combo Deep Dome Lamp Fixture, Turtle Tuff Halogen Bulb, and ReptiSun 5.0 Mini Lamp fixture features polished aluminum for maximum light and heat output Turtle Tuff Bulbs are durable and splash resistant Ideal for tropical setups UVB helps prevent or reverse metabolic bone disease