... - 100-240V compatible - HPS & MH convertible - UL, CUL, CE, ROSH certification - same quality as QUANTUM- convertable for HPS and MH lamps- High lumen efficiency ... : no more humming and buzzing- Approval: UL,CUL, EMC, ROSH 1000W HPS/MH ballast/ US style electronic ballast/ digital ballast/ 1000w HPS/MH ballast/hydroponics/air cooled reflector