PL-S5W/TUV/G23 UV Germicidal Replacement Lamps replaces: Aqua Medic Helix Max 80805, Coral Life 5 Watt, Hozelock Cyprio BioForce 500, BioForce 250, Easy Clear 500, Eco Clear 500, UVC 1311, UVC 1312, UVC 1326, Vorton 500, Philips Lighting, 381863, PL-S-5w/TUV, Tetra Pond PLS5, Therapure 201M, TPP2010, UV Mini Pond Clarifier, UV5, Ushio 3000321, GPX5 The lamp is 5 watts, 83 mm in length, rated effective life 10,000 hrs., change once a year.