Ballast Protective box(2*ballast) ballast box, guarantee the normal and safe use of ballast. is used combined with downlight Ballast Protective box(2*ballast)power(for ballast): 2*9w, 2*13w, 2*16w, 2*18w, 2*30w, 2* 40wthis kind of box is used to carry ballast, guarantee the normal and safe use of ballast. It is usedcombined with downlight fixtures that have PLC lamps.