23:26 Mar 18, 2020
Sharp-Cut-Off Fixture (ShCO) means a luminaire or light fixture that; by design of the housing, does not allow any light dispersion or direct glare to shine above a horizontal plane from the base of the fixture where light is emitted and limits the emission of light in the zone from 80-90-degrees from to less than 1% of the total light output from the luminaire, and must be installed in a horizontal position as designed. These fixtures produce no glare or stray light due to the exposure of the bulb light source because the source is recessed or shielded.
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The counter argument is that, with a sharp cut-off fixture, the levels of glare are lower and hence lower illumination levels may be acceptable
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There is lots of light, little or no glare (especially with a full cut off or sharp cut off fixture), no sharp deep shadows. One is not blinded, one can see.
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All outdoor site lighting fixtures shall be of the sharp cut-off fixture type to direct all ambient lighting down to the ground rather than laterally or skyward. |