Choosing The Right Color Temperature

Color Temperature

Color temperature describes the visual appearance of the color of light, commonly referred to as cool or warm. There are two scales used to characterize white light:

Color Rendering Index (CRI)
The CRI is a quantitative measure of a light source's ability to reveal the true colors of various objects in comparison to an ideal light source. The scale ranges from 1 to 100, with higher values indicating better color rendering. A CRI of 100 represents the most accurate color rendering, similar to natural daylight.

Think of CRI as an indicator of how accurately the light source displays colors. For example, paint colors may look different under store lighting versus natural daylight in a parking lot. Similarly, Instagram filters can alter the CRI to change the appearance of colors in photos.

Correlated Color Temperature (CCT)
CCT describes the appearance of white light in terms of warmth or coolness. Warm light has a lower CCT, while cool light has a higher CCT. Measured in Kelvin (K) on a scale from 1,000 to 10,000, color temperature indicates the appearance of light produced by a bulb. Lower Kelvin numbers result in more orange/red/yellow light, whereas higher Kelvin numbers produce cooler, bluish light.

Matching the color temperature of light to the surroundings creates a harmonious and comfortable environment for the eyes. For instance, using the same color temperature lights throughout a room will give it a clean, even feel.

Kelvin
The Kelvin scale is used to define the appearance of white light. Warm colors correspond to lower CCT values (around 2400K), while cooler or bluish light corresponds to higher CCT values (up to 10,000K). The CCT is correlated to the Black Body on the CIE color diagram.

Tip: To achieve a cohesive look in a room, use lights with the same color temperature throughout the space.