What is Bulb Temperature?

The term “temperature” is often used in regard to LED light bulbs and can be confusing.  Temperature refers NOT to the heat of a bulb, but rather is refers to the colour of light that a bulb produces.  A more accurate term would be the “frequency of light”.  In practical terms, that means:

The lower the temperature, the redder the colour.
The higher the temperature, the bluer the colour.

In LED lighting, the colour temperatures vary roughly from 2700K, (very warm white) to 8000K which is sky white, almost stark blue-white light.

Below is the temperature scale: