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• Cree XLamp XB-D LED 100 lumens per watt 2 x 2 Troffer Reference Design. This reference design details the design of a 100 lumens per watt 2 x 2 troffer using Cree's XLamp XB-D LED. This XB-D 2 x 2 troffer is intended to be used in office and commercial applications that historically have used T8 fluorescent luminaires. The XLamp XB-D LED is designed specifically for high lumens per watt applications. The high flux output and efficacy offered by the XLamp XB-D LED make it a particularly strong candidate for use in a troffer. The performance of the XB-D LED enables a troffer that provides energy savings while delivering superior light output