Color wheel (optics)

A color wheel or other switch for changing a projected hue (e.g., for an optical display) is a device that uses different optics filters within a light beam. Common usage includes continuously-rotating wheels for seasonal home displays (e.g., at Christmas) and controllable color wheels for a particular instrument (e.g., SeaChanger Color Engine for stage lighting), while non-wheel devices include scrollers and semaphore types with lever arms (e.g., on the 1897-1917 Grand Army Plaza fountain).

A color wheel lamp, c. 1960, utilized for decorative purposes, in the collection of The Children's Museum of Indianapolis.
An 1895 mechanical color wheel, used for experiments with color vision.
A mechanical four-petal RGBW color wheel inside a 1998 DLP video projector.
For the "planar circular chart" with a spectrum of colors, see colour wheel.
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