10W UV-C 254nm Germicidal Hot Filament Lamp Water & Air Purification 120V Ballast Kit 10W Germicidal UV 254nm Hot Filament inside Quartz Tubing 120V Ballast Kit Can be inserted in water up to the white ring, comes with regular wall plug Overall Length(Lamp & Fixture): Max 390mm Base Type: T5F Pins Conf. Square Box ; Thread Base: 35mm Light Length: 250mm ; Lamp Length: 332mm