Kelvin Degrees-Daylight and Artificial Light by Arianna and Valentina

"Example of different light temperature"

Kelvin Degrees are used to measure color temperature. The higher the color temperature (5000 K or more), the cooler the colors (blueish white); the lower the color temperature (2700-300 K), the warmer the colours (yellowish white through red). When taking a picture, the colour balance has to be taken into consideration.
"Film is made for specific light sources (most commonly daylight film and artificial light film), and used properly, will create a neutral color print. Matching the sensitivity of the film to the color temperature of the light source is one way to balance color. Filters on a camera lens, or color gels over the light source(s) may also be used to correct color balance."(Wikipedia)

Below there are a daylight film photo and an artificial light film photo: