Building a Color Mix Box

[Dovahkiin]

I've been perusing a lighting textbook I found recently and it mentions a box of three 3" fresnels controlled by household fixture dimmers that can be used to experiment with different colors and how they mix. I've been looking into building one myself, but the cheapest I've seen the fresnels for was about $100 each which is a bit out of the price range of a mostly jobless high school student. Are there cheaper fixtures I can find for this kind of thing? Am I looking in the wrong places for these fixtures? Does this even sound safe (this book was from the early 90s so it's possible things have changed regarding this kind of contraption)?

[jglodeklights]

You could easily use clip work lights from the local hardware store, or you can buy something like THESE. Any fixture that outputs light with some form of controlled directionality will work.

[Dovahkiin]

Those actually look perfect and pretty cheap. Thanks!

[venuetech]

Try some single source (subtractive) CYM color mixing this can be done on a classroom overhead projector.