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Global standard 220V-240V/50Hz-60Hz
Standard for USA/Canada 120V/60Hz, 277V/60Hz
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Interference

Physical phenomenon produced when waves that are out of phase are superimposed; it can result in selective weakening of the intensity of various wavelengths. Interference is used in filters and reflectors for selective transmission or reflection, respectively.

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Handbook of Lighting Design

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Further topics on optics

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