How to Use the Color Temperature Guide
Color temperature, measured in Kelvin (K), describes the hue of a light source. Counterintuitively, lower Kelvin values produce warm, orange-tinted light, while higher values produce cool, blue-tinted light. This guide lets you enter any Kelvin value (or pick from common presets) and instantly see the color name, visual appearance, recommended use cases, and typical light sources in that range.
When buying LED bulbs or fluorescent lights, the Kelvin value is printed on the package. Use this tool to choose the right tone for each room. Bedrooms benefit from 2700–3000K warm white; offices and kitchens work well with 4000–5000K cool white; photography and color-critical tasks call for 5500–6500K daylight.
Frequently Asked Questions
Physically, hotter objects emit bluer light (think of stars: blue stars are hotter than red stars). The scale is based on the color emitted by a theoretical "blackbody" heated to that temperature in Kelvin.
2700K or lower is recommended for evening and bedroom use. Blue-rich light above 5000K suppresses melatonin more strongly, making it harder to fall asleep.
Research suggests warmer light (2700–3000K) promotes relaxation, while cooler light (4000–6500K) promotes alertness and concentration. This is why offices typically use cool light and bedrooms use warm light.