Elk Industries, R-K ManufacturingMELBOURNE, Fla., Jan. 7, 2011 — The Tune-a-Flex element from Elk Industries LLC acts as a color filter. It looks like an ordinary piece of glass, but, when held up to a light and looked through, it will "filter" light into a red color. When the plate is tilted, from one angle to another and in the same plane, it changes color from deep red to bright green. Guaranteed efficiency is >90% and, typically, ≥95%. There is no refractive activity to cause problems for imaging applications. 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