Light reading

What is Colour Temperature

You may have noticed there is likely a visual difference between the light coming from your garage and the light coming from your dining room chandelier. The difference is in the temperature of the light. But what does that mean exactly?


We’ll start at the beginning. Colour temperature was first explored in the late 1800s, when the British physicist William Kelvin heated a block of carbon. He observed as the block changed colour as it heated up, going from a dim red, through various shades of yellow, all the way up to a bright bluish white at its highest temperature. The resulting measurement scale for colour was named after Kelvin.

Kelvin Scale

Colour temperature is now the way we describe the appearance of light. You’re probably familiar with terms like “cool white” and “warm white” lighting, like those you’ve seen on a standard light bulbs, but most bulbs are also labelled with their degrees in Kelvin. Kelvin (K) typically ranges on a scale of 1000, to 10000. The colour temperature of a bulb gives us an idea of what the look and feel of the light produced will be, if it has a low Kelvin it’s warmer, and the higher up the scale it goes, the cooler the light produced will be. Typically, bulbs with a colour temperature between 2000-3000K give off a warm white glow. Between, 3100-4500K are more of a cool white, and 4600-6500K give off light similar to daylight.

Keep in mind the use of the terms “warm” and “cool” is a bit of a contradiction because when examining the Kelvin scale, you’ll see the “cool” light is actually hotter than “warm” light. The terms aren’t intended to describe the actual temperature of the light but rather the resulting aesthetic.

See the below image to compare Kelvins to their corresponding colour temperature:

What Colour Temperature Should I Use?

Having sufficient ambient lighting, also known as general lighting, in your home office space will help reduce strain on your eyes. The contrast between the light being emitted from your screen, and a dark space around it isn’t easy on the eyes. Instead, try to ensure your workspace is in a room that includes lighting such as potlights or large pendants to provide overall even illumination. Or, indirect floor lamps that bounce the light off walls and ceilings without producing glare. If these are dimmable, even better!

So how do you know what colour temperature works best for your space? Should your lighting temperature be different for your bed side table and in your office? Ultimately, it depends on the viewer’s desired appearance and feel that they’re going for. Typically, lighting on the warmer side is preferred for bedrooms, bathrooms, restaurant/commercial ambiance lighting, and decorative outdoor lighting. Whereas lighting that’s on the cool end is best for task lighting, security lighting, display areas, and garages. Our team will help ensure you’re getting the perfect colour temperature for your space.


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