Uxl-302-o, xe 300w, 300 watt, 20volt, 900 hour rated bulb with base. ushio uxl short-arc xenon gas discharge lamps feature a continuous wavelength spectrum that closely approximates daylight color temperatures and have strong color rendering characteristics. Uxl lamps are used for a variety of scientific, analytical and medical illumination purposes including spectrophotometry, solar simulation, microscopy, handheld searchlights and surgical lighting.