Traditionally, color mixing of light is done with many projectors and filters, but now there is an easier way.
Improved light emitting diodes are used in this device to allow continuous variations of the red, blue and green components as well as an adjacent white LED.
Colors are mixed passing through a special membrane. Suitable diffraction gratings are included for direct viewing of the component spectra.
Also included are curriculum materials based on extensive classroom testing. Requires 4 "AA" batteries (not included).