... 4) lamp holder assemblies of T8/T10 (7-12)in serieswith 24 in parallelr,T8/T10 fluorescent lamp,Isolated Power, high efficiency and high PFC ,It ... -voltage protection,input protection,Open Loop Protection,Over Temperature Protection lamp holder assemblies of T8/T10 fluorescent lamp,Unisolated constant current power,High PFC/High efficiency