Today, there are many different types of LED lights, each with slightly different shades of colour, even different shades of white. To describe the shades of white, the experts use the phrase "colour temperature". This is not the temperature of the light bulb, but if I may use the language of scientists, it is the temperature of an ideal black-body radiator giving out light of comparable colour to the light source. What does that mean? You might call it the colour of "red-hot", "yellow-hot" or "white-hot", even if the LED light itself does not give out much heat. So, we have some LEDs which give out a yellowish, warmer, more natural-looking white, or colour temperature of around 3,000 Kelvin. Some have a harsher white colour, with a little bit of blue light as well, or a colour temperature closer to 4,500 Kelvin or more.