The designation Kelvin color temperature describes the warmth or coolness of a light source. Measured in degrees, the scale ranges from 1700°K to 7500°K; the lower the number, the warmer the color. Candlelight, sunsets, incandescent lamps and halogen lamps produce a warm color of light. Noonday sunlight, cool white fluorescent and daylight fluorescent bulbs produce a cool color of light. Residential interiors and skin tones generally look better under a warm color of light. New fluorescent lamps are typically rated in three Kelvin temperatures: 3000°K, 3500°K and 4100°K. The first two are most commonly used in residential lighting.