Lighting 101: Color Temperature – What is the Kelvin Scale? - Larson Electronics
Light Bulb Brightness - The Home Depot
LEDspan - LED light colour temperature is measured in Kelvin, K. Light fixtures are found in colour temperatures on the Kelvin scale of between 2700K (extra warm incandescent), 3000K (warm white halogen)
How to choose color temperature of LED lighting for home & office
Understanding Lumens vs Kelvin | LED Lighting Wholesale Inc Blog