How does a color change works?

It consists generally of a small, geared motor with a disc. This can be made of glass, glass segments or a polymer material in a number of colors.

The motor causes the disc to revolve in from of the common end, altering the color of the issuing light. Lower priced systems use colored films of glass whilst most others make use of dychronic filters. 

In animation illuminators instead of a disc, there is a turning drum of glass or polycarbonate with color films or varnishes applied in special patterns to create movement and rapid color changes.

Plastic optical fiber, End emitting fibre, Side emitting fibre, Sparkle otpcial fiber