The Cree XLamp? XP-E2 White LED is Crees newest version of the older XLamp XP-E. Unlike the original XP-E, the XP-E2 is built from the SC3 technology platfrom and can boast higher lumens per watt and lumens per dollar. This XP-E2 White LED has an identical foot-print (3.45mm square) as the original XP-E, but by using silicone carbide SC3 technology Cree has increased lumen output by more than 20% and doubled the lumens per dollar over the original XP-E. The XP-E2 White LED is designed for high-lumen lighting that can range from indoor to outdoor, to portable and lamp retrofits. Both versions (1-Up & 3-Up) of the XP-E2 White LED are designed to work with secondary optics from Carclo; Carclo is a leader in molded poly-carbonate lens systems. The 1-Up secondary lens system combines a plastic holder and lens that sits on top of the 1-Up MCPCB, while the 3-Up optic is a one-piece system with three legs that sit down into corresponding holes on the 3-Up MCPCB. These secondary optics focus light into narrow, medium, wide and elliptical patterns.