On Lighting Colour Temperature

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The colour of light can have a very profound effect on how Architecture looks like during the night, and sometimes even in the day. With the advent of LED technology, there has been an ongoing refurbishment works across the globe to change many street lights from the warm yellow hue to cold bluish tones. But what is colour temperature?
As shown by this chart from https://www.downlights.co.uk/faq-which-colour-temperature-.html, light can have a variety of "temperature" which corresponds to its colour. Temperature is measured in Kelvin and the higher the value, the more bluish it becomes.
  • 2700K - Extra warm white LED: Appears warmer
  • 3000K - Warm white LED: Slightly white but not too cold
  • 4000K - Cool white: Slightly bluish
When choosing lighting, it is recommended to get a warmer hue when used in areas intending for relaxation, while choosing a colder tone when it is important to be alert and see all details. As such, a bedroom may be using 2700K while a clinic may be using 4000K.
In some cases, it is also possible to find LED that changes colour temperature according to how dim the LED is. In these cases, the dimmer it is, the warmer the light becomes, and this is a good solution if a space requires both kinds of lighting.

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