This paper describes the construction and use of a color light mixer that uses different color LEDs. The idea was partly inspired by two papers.1,2 The first one describes how a standard LED can be converted into a point-light source, and the second one explains how a Ping-Pong ball can be used to mix polarized color light from two lasers.
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Gorazd Planinšič; Color Mixer for Every Student. Phys. Teach. 1 March 2004; 42 (3): 138–142. https://doi.org/10.1119/1.1664377
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