Guide to Colour Temperatures and Lumens

Have you ever wondered what 3000K colour temperature means when you buy an LED bulb? Here we explain colour temperatures and lumens and which each one means, so next time you purchase a light bulb you know exactly what specifications they mean.

LED colour temperature is the colour of the light that is emitted from the bulb. The most common colour temperatures are warm white, daylight white and cool white, which are represented by degree Kelvin (K) which we shall explain further.

Kelvin (K)

The light colour temperature is measured in degrees Kelvin (K). The scale runs with the warmer the light colours the lower the Kelvin rating. So, for example a 3000K bulb will emit a warm/ orange light whilst a 6000K will produce a cooler white light with a blue/white glow.

Warm White (1900K – 3200K)

The colour temperature for warm white differs from 1900K to 3200K and produces a similar colour to a traditional incandescent bulb. The warm white bulbs are perfect for living rooms for a cosy ambience, and for replacing traditional bulbs.

Natural White (4000K – 5500K)

Neutral/natural/daylight white produces a natural light, hence the name. It is perfect for contemporary homes that have a fresh look, kitchens or even for office or retail lighting as it can be perfect for visual tasks due to the higher contrast than the warm white light.

Cool White (6000K+)

The cool white bulbs can look slightly blue in colour and is perfect for kitting out warehouses to produce a clean and crisp working light. The cool white bulbs could work for modern day homes that need to brighten up, but these bulbs are more suited to work related rooms.



Light bulbs get their brightness measured using something called Lumens. Many of the LED bulbs can produce a high lumen light output with less wattage/ power consumption than say a halogen bulb. The best way to look at it is to see which light bulb produces the greater number of Lumens for the smallest amount of power/wattage used.

Watts to Lumens

LED bulbs usually produce the highest number of lumens with less watts compared to incandescent, halogen and CFL. For example, a 15W bulb may produce 90 lumens of incandescent light, whereas an LED version can produce 135 lumens. So, choosing the type of bulb also helps with the number of lumens you can achieve.

How Many Lumens Do You Need?

This depends on a number of factors such as room size, shape, height of ceiling and so on. Some rooms may require extra light, but we have composed a rough guide to help.



Kitchen Worktop

Living Room




Bathroom Sink

Reading Room

300 – 400 Lumens

700 – 800 Lumens

400 – 500 Lumens

300 Lumens

300 – 400 Lumens

500 – 600 Lumens

700 – 800 Lumens

400 Lumens