What color bulb is best?
Light bulbs come in a choice of colors now; which color is best?
Check the “Lighting Facts” label on the bulb carton. The label is required for all bulbs sold at retail for residential use and provides operating information, as well as color information about the light from the bulb. Color information is shown as “light appearance.” A bulb that provides “warm” light with a rating of 2700 to 3000K (K stands for Kelvins) will closely match the color of a standard incandescent bulb. Bulbs with higher Kelvin ratings, such as 4000 or 5000K, will appear blue-white or “cool.” See the bulb lit before buying it if you can.
By: American Lighting Association