The Hi-Tech Lamps part number F6T5/BL368-U is a 6 watt (6W), 42 volt (42V) UVA Blacklight Lamp made by Ushio. This lamp has a 15.5mm diameter and an overall length (excluding base pins) of 210.5mm with G5 miniature bi-pin bases. This UVA Blacklight Lamp has an average life of 3000 hours. It has an initial UV output of 1 watts, with a spectral peak at 368 nanometers (368nm). This lamp is also known as Ushio F6T5BL, F6T5/BL and F6T5/UVA.