The Hi-Tech Lamps part number F15T8/BL368-U is a 15 watt (15W), 55 volt (55V) UVA Blacklight Lamp made by Ushio. This lamp has a 25.5mm diameter and an overall length (excluding base pins) of 436mm with G13 bi-pin bases. This UVA Blacklight Lamp has an average life of 4000 hours. It has an initial UV output of 2.6 watts, with a spectral peak at 368 nanometers (368nm). This lamp is also known as Ushio F15T8BL, F15T8/BL, F15T8/UVA.