W hite light is the product of a combination of various wavelengths that are contained within the Visual Spectrum. As Isaac Newton demonstrated with his prism, White Light is broken down into various colors. In order to measure these colors a system was developed called the Kelvin Scale. The Kelvin Scale is used to measure the color temperature of a wavelength. Film stocks and video cameras are balanced for Daylight or Tungsten light.
Daylight film is sensitive to the blue wavelength.
While tungsten, film is sensitive to the red wavelength. Each of these films can be substituted for the other with the use of a special filter. The next time you buy film for your still camera look inside the packaging. There you will find a table of recommendations for the film. If it is Tungsten film and you are shooting outside, It will suggest using a special filter.