Cree Lighting UR2-48-45L-35K-S-FD LED Troffer Upgrade Kit 4 Foot/2 Lightbar 3500K Step Dimming - 4500 Lumens The UR Series 4ft (1219mm) LED upgrade kit delivers 4500 lumens of enhanced spectrum 80 CRI light Achieves over 100 lumens per watt at the system level This innovative kit is designed for retrofitting existing 1'x4' (305mm x 1219mm) or 2'x4' (610mm x 1219mm) luminaires to energy saving LED The UR Series is available in neutral or cool color temperatures and with step dimming or 0-10V dimming The UR Series upgrade retrofit kit is easy to install and fits into almost any existing linear fluorescen