... .High Efficiency 84LM/W 3.High Safety with Isolated Driver 4.CE,FCC,ETL,RoHS High Efficiency 22W LED Tube Features:1, High ... start, no flickering, no humming 5. High efficiency, constant current driver, with heat protection system can work under unstable voltage ... higher than other factories. 2. Particular circuit design with high efficiency, high quality, lower heat output 3.15000 hours actual test ...