What Color Temperature Is Best for Computer Work?
Many desk lamps and monitor light bars let you change color temperature, from warm yellow-white to cool blue-white. The numbers can be confusing. Here's what they mean and how to use them.
What the numbers mean
Color temperature is measured in Kelvin (K):
- Around 2700 to 3000K: warm white, like a traditional bulb. Cozy and relaxed.
- Around 4000K: neutral white. A balanced middle.
- Around 5000 to 6500K: cool white, closer to daylight. Crisp and bright-looking.
Lights like the BenQ ScreenBar Halo 2 and the YEELIGHT light bar cover roughly 2700 to 6500K.
A simple way to use it
- Daytime work: neutral to cool, around 4000 to 5000K. It matches daylight from a window and keeps the desk looking bright and clear.
- Evening work: warmer, around 2700 to 3500K. It feels more relaxed and matches typical home lighting.
- Color-critical work, like photo editing or design: neutral light around 5000K, and a lamp with high color rendering (a CRI or Ra of 90 or more).
Match your screen and room
Your desk light looks most comfortable when it's close to the rest of the light around you.
- If your room has warm lamps on, a cool desk light can feel harsh.
- If your screen uses a warm night mode in the evening, a warm desk light matches it.
- During the day, with a window nearby, cooler desk light blends in.
Brightness matters too
Color temperature and brightness work together. In the evening, lower the brightness as well as warming the color. A very bright warm light can still feel like too much.
Color rendering
Color rendering (CRI or Ra) is how true colors look under the light. Most good desk lights list Ra 95 or higher, which makes paper, skin tones and objects on your desk look natural.
For five lights compared for computer work, see our desk lamp for computer work comparison.