What is light colour?
The light colour of a light source refers to the colour temperature, which is measured in Kelvin or K. The Kelvin value refers to whether the light source emits warm or cool light. A low Kelvin value describes warm white light, from 2700K. The higher the value, the cooler the light appears, for instance, 5000K would emit a cold white light.
Therefore, when buying, it is important that to consider the purpose of the light source in advance. You will be able to see the Kelvin value on the packaging, to identify what colour temperature you want.