Color temperature?

Question

If there is more than one light source, they should be the same temperature, right? If this isn't always the case, when should they be different?

Answer 1

Customarily lighting has always been separated into 2 color spectrum for the purposes of photography - daylight balanced and tungsten balanced. Tungsten refers to the white hot filament inside a bulb. It burns much warmer (orange) than daylight which has more spectrum of colors within itself, but the camera will see it as blue. So, you never want to mix orange and blue. It will look awful. You have to put a colored gel on one or the other.