UL,CE,FCC & ISO approval 1.Operating frequency:250KHZ 2. 5YR warranty 3.lifetime> ... type induction lamp with high lumen efficiency, high lumen maintenance, long lifespan and excellent CRIYML's 100 to 300W electronic ballast ... case features high powerfactor (>0.96), low energy loss and long lifespanApplications: industrial factory, warehouse, stadium, airport, railway station, gas station ...