Therapure Uv TPP540, TPP5400 Bi-Pin (2P Double Ended) Base Air Purifier UV Bulb Effective Hours Rating: 10,000hrs - Ultraviolet Germicidal Light Bulb Includes Free Gloves for Installation Used in the following Models : TPP540, TPP5400,TPP-540, TPP-5400 ,TPP 540, TPP 5400 2 Pin Double Ended Lamp