... PC cover2.Adopt high quality ballast,comply with 3C,CE standard;can pass EMC and RoHs.3.High quality:PF>0.99, ... THD<10%,Usual quality:PF>0.95,THD ... <30%4.Use tri-phosphor powder fluorescent lamp,more brightness,high ... ,hotel,office etc T5 Batten fixture with high quality electronic ballast