5 Watt Fish Mate AN264 UV Sanitizer / Germicidal Lamp 5W G23 2 Pin Base 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: 4.8" Long , Lifetime: 10,000 hours