The Hi-Tech Lamps part number F40T10BLB-U is a 39.5 watt (39.5W), 106 volt (106V) UVA Blacklight Blue Lamp made by Ushio. This lamp has a 32.5mm diameter and an overall length (excluding base pins) of 1198mm with G13 bi-pin bases. This UVA Blacklight Blue Lamp has an average life of 5000 hours. It has an initial UV output of 8.1 watts, with a spectral peak at 368 nanometers (368nm). This lamp is also known as Ushio F40T10BLB, F40T10/BLB and 3000138.