... and solid mecury,high efficiency,friendly environmental,long lifetime; fluorecent lamp fixturePower: HE series:4w,6w,8w,13w,14w,21w,28w ... series:24w,39w,54w,49wFeatures:1.Material:Aluminium body or Plastic body with PC cover, nice appearance2.Adopt high quality ballast ... >99%),low THD(<10%)4.Use tri-phosphor powder fluorescent lamp,more brightness,high efficiency5.No noise,no flicker,low work ...