... downlight fixtures(PLC lamp). ballast protective box(1*ballast type) power(for ballast): 1*9w, 1*11w, 1*13w, 1*16w, 1*18w, 1 ... *20w, 1* 26wthis kind of box is used to carry ballast, guarantee the normal and ... safe use of ballast. It is used together with downlight ...