supply of led emergency/inverter tube light 20 watt. , led emergency/inverter tubelight 20 watt retrofit type, luminous flux: ≥ 2,000 lumens, up to 4 hrs of backup time, auto cut-off for longer battery life, voltage surge protection up to 4kv, long life of 1 5000 hrs . operating voltage of the fitting should be between 140 v to 250 v ac. type of battery inside fitti ng is li-ion. fitting lumen efficacy should be 100 lumen/watt or above. fitting driver efficiency should be m ore than 85%. led of the fitting should be lm-79 and lm-80 certified. temperature-6500k of make bajaj, or ent electric or similar. [ warranty period: 30 months after the date of delivery ] ]