This listing is for ONE Piece of the Tetra Pond Premium Compatible 19528 - Tetra 18 watt UV Lamp for Tetra UV2 & BP2500 & BP4000 , Lamp 10,000 Hour Long Life Lamp 6 Month Warranty This Premium Quality Replacement lamp is Manufactured by Pro Lighting and is Guaranteed to Meet or Exceed the Original Manufacturers Specifications. The use of the Original Manufacturers Name is for Identification purposes only. The name Tetra Pond is trademarked and wholly owned by Tetra Pond . We do not sell or distribute Tetra Pond Products