UV Light UV-ATS4-450 Superior Bulb for Aqua Treatment Services ATS-4-450, 10000 Hours Use in Models: DWS-8V/EV-8E/SE-8V/SL-8V Ats4-450 superior up bulb for aqua treatment services ats-4-450,10000 hours For use in models: DWS-8v ,ev-8e, se-8v , sl-8v Note: Up lamps will continue to emit visible light but lose germicidal effectiveness over time, 10,000 hours 22 watt, 4 pin base