geopiet Mar 18, 2020:

English term or phrase: cutoff lighting
Polish translation: oświetlenie z oprawami o ograniczonym rozsyle

https://www.proz.com/kudoz/english-to-polish/electronics-ele...

geopiet Mar 18, 2020:

oprawy oświetleniowe Oprawy klasy G1, G2 i G3 to oprawy o częściowo ograniczonym rozsyle światłości (ang. Semi-Cutoff).
Oprawy klas G4, G5, G6 odpowiadają oprawom o rozsyle ograniczonym (G4, G5 – ang. Cutoff;

G6 – ang. Full Cutoff), oprawa klasy G6 nie emituje światła powyżej horyzontu.

Klasę D0 stosuje się dla opraw, w których źródło światła lub jego części mogą być bezpośrednio widoczne;
klasa D6 to oprawy o najmniejszym wskaźniku olśnienia przykrego.

geopiet Mar 18, 2020:

Sharp-Cut-Off Fixture means the same as Full-Cut-Off Fixture.

- https://www.mississippimills.ca/en/live/resources/Illuminati... - page 3

geopiet 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.

Frank Szmulowicz, Ph. D. Mar 18, 2020:

L158W-SCL-WHT-J
Sharp Cut-off Louver
https://www.villalighting.com/ASSETS/DOCUMENTS/ITEMS/EN/1182...