Sylvania LEDVANCE Troffer Retrofit Kits are a preferable LED alternative for retrofitting traditional fluorescent lens troffer luminaires. The Troffer Retrofit Kits feature an easy and quick install in just under 4 minutes, and they conveniently bypass your existing ballast. This 2×4 3-lamp retrofit delivers 4,800 lumens of 5000k light. Applications include: commercial spaces, offices and retail applications. Sylvania NAED 75499.