5W UV Bulb TPP2010 for Therapure 201M HEPA Purifier TPP201M UV-C Lamp 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