What are CCT and Kelvin Temperature?
Correlated color temperature (CCT) will tell you what hue and tone of white to expect from a specific bulb or fixture. CCT is measured in Kelvin (K) and different temperatures on the Kelvin scale represent different colors of light. For example, a fixture at 2500K will produce an orange/yellow color; and at 5000K a blue/white. As the Kelvin temperature increases the CCT goes from a Warm White, to a Natural White, and finally a Cool White.
Different CCTs can provide a range of benefits depending on the application of the light fixture or bulb.
In relaxed environments such as a bedroom, living room, or decorative patio a warm white (2500K-3500K) is recommended because it gives off a more relaxed and inviting environment. However, in an office, classroom, or lobby a natural white (3600K-4500K) is recommended as it is better for tasks and staying active. For hospitals, warehouses, and commercial exteriors where visibility and alertness is necessary a cool white (4600K-5500K) is recommended.