XLamp® CXB1820 LED Arrays Cree LED XLamp® CXB1820 LED Arrays are available in 2-step color consistency and have a 12mm optical source. These 17.85mm x 17.85mm arrays offer high CRI and 115° viewing angle. They are available in 70, 80, 90, and 95 minimum CRI options. Cree LED XLamp CXB1820 LED Arrays utilize a uniform emitting surface designed for directional and non-directional lighting applications and luminaire designs.