LSE Lighting compatible UV Bulb for use with Air Purifier TPP440 TPP4400 Brand: LSE Lighting Base Type: Bi-Pin (2pins on Each End) Length: 16"; Bulb Type: Ultraviolet UVC This UV replacement lamp by (LSE Lighting Brand) is fully compatible for use with TPP440 UV Germicidal Air Purifier. All lamps listed are compatible brand (LSE Lighting) UV products. We do not sell Envion/Therapure brand lamps. All Envion/Therapure brand names, trademarks and logos are property of Envion/Therapure respectfully.