Primary Colors???????

So.... as a visual arts student you must know the basic principles and elements of design. They also teach you how colors realate to one another such as the primary colors, secondary colors and complimentary colors. You would think from chilhood to never forget that there are three primary colors: red, blue, and yellow. That theory still applies to the arts when painting or dealing with other forms of visual art. This isn't quite a fact when working with lights. In my first day of Intro to Light and Sound class, I some how missed the part where painting primary colors and lighting primary colors differ. When working with lights your primary colors are red, blue and green. I had to have been lost for the first 20 minutes of class, but now I will never forget what my "NEW" set of primary colors are. "Green light" means it's a go.