The ZR-RK Series delivers superior energy efficiency of up to 132 lumens per watt for maximum energy savings. While some LED retrofit products replace only the source and leave the fluorescent optic and aesthetic unchanged, the ZR-RK retrofit completes the transformation: the old housing is concealed beneath an appealing new look and LED-optimized optic, while leaving the plenum undisturbed. Optimized for installation in under four minutes, the ZR-RK retrofit delivers maximum improvement for minimum effort. The ZR-RK retrofitt is compatible with most existing 2’x4’ and 2’x2’ recessed troffers with a minimum housing depth of 3 inches. The ZR-RK retrofit features a matte finished housing for less glare and better light distribution, standard dimming to 5% and 80+ CRI — all in a package with a price as attractive as it looks.