Dolan-Jenner Fiber-Lite Mi-LED-US-DG LED Illuminator with Dual Gooseneck Light Guide Complete system of high quality annular ring light fiber optic system with powerful and bright white LED light source LED Life: 40,000 hours, LED color: 5000K, no lamps to replace and no down time! Dolan-Jenner model LP25A36M fiber optic ring light assembly fits 66mm diameter objectives with 3 no-mar set screws. Working distance 2 to 9 inches Our LEDs provide up to 20% higher output than 150 watt halogen lamps and a lifetime of maintenance free and energy efficient operation Universal Voltage input: 100-240 VAC and CE & ETL marked for global use (115v North American line cord included)