... 3.Completely silent 4.Approval: CE, GS, TUV, EMC, ROSH,UL The up and down structur can maximize the utilize of ... be prosecuted to the full extent of the law. Features1.Run for HPS lamps2.High power factor:PF≥0.983.Low ... hang the lamp, no need any external starter and compensation capacitor.9.Completely silent: no more humming and buzzing10.Working temperature ...