Black light mercury lamp-250 400W/Mercury lamp-black Characteristic: The glass shell adopts UV-transmitting glass. Black light mercury lamp-250 400W/Mercury lamp-black1. Type: 250, 4002. Wattage: 250W, 400W3. Base: E39/E404. Life: 1500hrs5. Dia:90mm, 118mm6.Wave length: 365(nm) Characteristic: The glass shell adopts UV-transmitting glass.Appliance: Be fit for fluorescent flaw detection and ...