Ballast Cover Retrofit Kit LED BALLAST COVER (4' & 8') Troffer Retrofit Kits CL-LED-REFL-22 (2') CL-LED-REFL-24 (4') CL-LED-TRK-K11 (2') CL-LED-TRK-K11 (4') CL-LED-TRK-K15 (2') CL-LED-TRK-K15 (4') Indirect Troffer Retrofit Kit CL-LED-TRK-IND