The GPX9 is a 9 watt preheat start, ozone free, Compact Germicidal (AKA 254nm or UVC ) Lamp with 2.4 Watts UV. Typical lifetime is 8000 hours. This lamp has one G23 2 pin base on the 28mm wide x 145mm long (excluding pins) clear biaxial twin tubes. This item is Made by Ushio, and is also commonly available from Philips, Osram-Sylvania, GE, American Ultraviolet, Sankyo-Denki, among many others, as part numbers PL-S9W/TUV, PLS9TUV, GBX9/UVC, 15877, GPX9, PL9/UV, 23373, GCF9DS/G23/SE/OF and many more. Product Warning: Germicidal lamps emit harmful ULTRAVIOLET RADIATION (UVC). Avoid direct or reflected exposure as this can cause serious skin burns and eye injury. This lamp SHOULD NOT BE USED FOR ILLUMINATION PURPOSES. Skin and eye protection should be worn at all times when operating.