The Hi-Tech Lamps part number FPX11/BL368-U is a 11 watt (11W), 91 volt (91V) UVA Blacklight Lamp made by Ushio. This lamp has a 13mm diameter and an overall length (excluding base pins) of 215mm with G23 two pin CFL base. This UVA Blacklight Lamp has an average life of 4000 hours. It has an initial UV output of 1.7 watts, with a spectral peak at 368 nanometers (368nm). This lamp is also known as Ushio FPX11BL and FPX11/BL.