SMART UV Lite Ultraviolet Sterilizers deliver optimum protection against harmful aquarium pathogens. Includes working bulb. SMART UV Lite Sterilizer Performance Recommendations & Specifications Model No. / Watts - 02218-S/18 Max. Pond Size - 1,100 Gal No. Lamps / Watt - 1/18 Water Flow Rate Algae & Bacteria 30,000 µWs/cm2 Suggested / Maximum - 219 GPH / 365 GPH Water Flow Rate Protozoa 90,000 µWs/cm2 Suggested / Maximum - 73 GPH / 121 GPH Input Watts -18 Output Watts - 5 Dimensions Lgth. x Dia. - 21.75" x 2.5" Inlet / Outlet Input - 2" Socket Voltage - 120V AC