5 Watt 381863 ,TUV PL-S 5W/2P UV Water Sterilizer / Germicidal Lamp 5W G23 Bulb Application: UV Sterilizers UV Clarifiers UV Water Purifiers G23, 2-pin Base - 2-Pin PL-S lamp base contains a special starter for almost instant starting on electromagnetic drivers G23 Base , Length: 7.25" Long , Lifetime: 10,000 hours