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.
Topics
Education
REFERENCES
1.
G. T.
Gillies
, “Altered light-emitting diode point source emitter
,” Am. J. Phys.
48
, 418
–419
(May 1980
).2.
A. A.
Middleton
and S.
Sampere
, “Color mixing via polarization
,” Phys. Teach.
39
, 123
–124
(Feb. 2001
).3.
I used the following LEDs from Kingbright : red L-53SEC-H, green L-53VGC-E, and yellow L-53SYC-H, and blue NSPB500S from Nichia. Kingbright: http://www.kingbright-led.com/ Nichia: http://www.nichia.co.jp/index_eng.html.
4.
You can get one for about $50 U.S. from Educational Innovations (see http://www.teachersource.com).
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© 2004 American Association of Physics Teachers.
2004
American Association of Physics Teachers
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