Overview: Cree R2 bin emitter (Cree original BIN label available in picture gallery on the left) Cree Flux/ Color BIN: R2 WG3.7V typical driving voltage Premium " Star" connection board for heat dissipation & easy wiring & upgrading existing star Luxeon emitters Specification: Weight Approx:2.1g Size Approx:2 x 0.5 x 2