Lightbulb specs often describe their white color in terms of color temperature, in Kelvin. This refers to perceptually matching the color of an ideal black bod

Lightbulb specs often describe their white color in terms of color temperature, in Kelvin. This refers to perceptually matching the color of an ideal black body glowing at the specified temperature. The documented color temperatures of different lights vary considerably. Rarely do they match sunlight. Daytime, overhead sunlight at the Earth's surface has a bluer spectrum than most lightbulbs, but sunlight doesn't look bluish-white because color perception adjusts rapidly for ambient light, and sunlight is so bright it dominates even when it's seen indoors through a window.