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Visual stimulation and lighting standards

Light is a form of "energy" that stimulates vision.

The stimulation transmitted by the visual environment through the eyes depends on the lighting method and the state of the illuminated space. Satisfactory vision does not rely solely on sufficient light, but also on the quality of light. The recommended illumination level for visual tasks is based on the degree required for visual function, with due attention to economic conditions.

As for the quality of lighting, the only generally recognized standard is still the glare index limit, although we have always wanted to express a good visual environment with a formulaic standard, which is best to take into account the appropriate brightness distribution, the color quality of light and the illuminated space, the shape of light, the direction of light, the spatial illumination, and the plane illumination. However, so far, all of this has not been fully determined.