Request InfoElk Industries, R-K ManufacturingThe 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, “filters” 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. Five types cover five spectral ranges, which can accommodate the entire visible wavelength range, with some overlap. 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