The color of light, expressed in Kelvins (K). The sun is about 5800 Kelvins. This is called a "temperature," because the hotter fire gets, the more it changes from a warm yellow glow to white.
The lower the Kelvin rating, such as the common incandescent/tungsten bulb, the warmer, softer and more yellow the light. The higher the K number, the cooler, whiter and bluer the light. See white balance
Light In Degrees of
Source Kelvin (K)
Match/Candle 1,700-1,800 Warm/
Incandescent 2,600-3,000 Yellow
Halogen 2,800-3,400 |
Fluorescent 3,000-4,300 Daylight
Outdoor sun 5,000-6,000 |
Outdoor shade 6,000-7,000 Cool/
North sky 10,000+ Bluer
LED lights range approximately
from 2,600 to 5,200 K
From Warm to Cool
Increasingly, light bulb packages show the color temperature as a measure from warm to cool. This is a halogen bulb label.