Color temperature for light bulbs is measured on the Kelvin scale. LED Bulbs come in a variety of colors, but the most common are in a range from 2700 Kelvin to 7500 Kelvin. The unfortunate thing is that the only consistent measurement is the Kelvin scale, Many manufacturers like to use terms like Day White, Natural White, Warm White, and Cool White, but there is not a standard that defines a Kelvin temperature to associate a color temperature with those terms. The warmer the light, the more yellow tones, the cooler the light, there are more blue tones. 2700-3200 – WW – Warm White, 4000-4500 – NW – Natural White, 5000-5500 – DW – Day White, and 6500-7500 – CW – Cool White