The colour temperature is measured according to the Kelvin scale. LED bulbs come in a variety of colours but the most common are of ‘A’ range from 2700K to 7500K. Many manufacturers like to use terms like ‘day white’, ‘natural’, ‘white’, ‘warm white’, and ‘cool white’, however, there is no standard that would associate the Kelvin scale with these terms. Thus, the Kelvin scale is the only consistent method of measuring light temperature. The warmer the light, the more yellow tones, the colder the light, there are more blue tones.
2700-3200 – WW – warm white
4000-4500 – WW – natural white
5000–5500 – DW – daylight
6500-7500 – WW – cold white