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I have wondered that myself. White "Lighting class" LEDs operate much like a fluoro tube, in this case most of them produce blue light and use mixtures of phosphors in the optics that are excited by the blue light to mix and create a white light LED.
Perhaps LPR filters for fluoro lights may be effective? The white LEDs I think usually mix only a handful of wavelengths together from different phosphors to produce visually white light so filters that stop only those wavelengths might be pretty effective.
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