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A variety of color shades allow you to customize the mood of your space. Many CFLs come in “warm” colors to match the yellowish light of incandescent bulbs, but you can also choose “cooler” colors with whiter or bluer light. The color of light is technically referred to as the “color temperature,” which is measure on the Kelvin scale. Lower Kelvin numbers mean the light has a warmer glow, like a candle, while higher Kelvin numbers mean the light appears cooler, like the sky.
ENERGY STAR qualified bulbs must fall within the range of one of the six designated color temperatures (2700K, 3000K, 3500K, 4100K, 5000K, or 6500K). The color temperature is listed on product packaging.
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