The Kosnic Ultra thin Opal LED DD range  Must be used with KOSNIC 9W/12W/18W LED DD lamp(KLED09STD/4P, KLED12STD/4P, KLED18STD/4P). Features: Save energy up to 50% compared with traditional fluorescent DD fittings. Lasts upto 4 times longer than with fluorescent DD Lamps. 3 hours emergency operating time  Direct replacement of GR10-q base fluorescent DD Lamps. Instant start. Negligible UV and IR radiation output. Supports maintained and non-maintained mode Specifications: Input Current (max): 35mA Output Voltage: 20-38Vdc Output Current: 50 mA Open Circuit Voltage: 39 Vdc Maximum Working Voltage: 36 Vdc Input to Output Protection: Double Insulation Battery: Samsung Li-Ion KBAT2200 Battery Voltage: 7.4V Battery Capacity: 2200mAh Battery Charge Voltage (max): 8.5Vdc Battery Charge Current (max): 210mA Battery Discharge Voltage: 6.0-8.4Vdc Battery Discharge Current (max): 270 mA Charging Time: 12h Battery Life: 4 Years Emergency Conversion Time: 1s Emergency Operation Time: >3h Depth: 24mm Maximum Case Temperature (°C): 75°C