Sunlight, daylight, incandescent, fluorescent, and other artificial light sources all have color characteristics that vary significantly. Filters give you better images by adjusting for these light variations.
Film and video are rated for a particular color temperature such as that of daylight or tungsten light. Filters are used to correct differences in color temperature between the recording medium and the light source.
Get the right colors with daylight film when shooting indoors, with tungsten lighting, and without a flash.
80C increases color temperature from 3800-5500 degrees Kelvin (commonly used with flashbulbs)