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

This term is used to describe the ability of the eye to perceive detail. It is measured in Visus, defined as the inverse value of the size of the smallest perceptible detail of a specified visual task in minutes of a degree.

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Handbook of Lighting Design

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