White LEDs used for general illumination are in the 2000K to 8000K CCT (correlated color temperature in degrees Kelvin) range with CRI (color rendering index) from 60 to 98. Color ranges are divided into basic white, cool, neutral, and warm groups for easy reference and 80 to 170 degree viewing angles. LEDS are available in surface mount packages such as SMD, CSDM, PLCC, J-lead, star array, and a wide variety of metric sizes as well as through-hole TO-252, DPak, SC-63, and radial lead configurations.