... 600W,400W,250W 110V&240V,HPS&MH CE,TUV,UL,CUL approved No fans inside ul certified electronic ballast, electronic grow ballast. ... circuit protection functions available.Easy installationEasy to hang the lamp, no need any external starter and compensation capacitor. ... operation.Soft startingDimming function is option.Approval: UL,CUL, EMC, ROSH,CE,TUV.Suitable Bulbs400W, 600W, 1000W HPS/MH bulb ...