Lanterns for area lighting

Details Lanterns for area lighting Lanterns for area lighting

1982-08-17

1984-05-22

Lechert, Jr., Stephen J.

Illumination

Curvilinear light source

362223, 362263, 362267, 362309, 362310, 362311, 362333, 362337, 362339, 362340, 362375, F21S 500

Patent

active

044505094

ABSTRACT:
The invention provides a lantern for an area light, particularly one having a cut-off light distribution. A central area of a transparent or transluscent bowl of the lantern has in alternation externally facing reflecting prisms and flats. There are sufficient flats to transmit at least one third of the vertical light and sufficient proportion of prisms to provide a completely flashed prism bank at the direction of peak intensity which is preferably 60.degree.-65.degree. from the vertical. The prism bank controls the vertical light, so that the intensity in a vertical 60.degree. cone does not exceed 80% of peak intensity, more efficiently than internal prisms. The flats have the additional advantage of facilitating ease of cleaning.

REFERENCES:
patent: 2195672 (1940-04-01), Gerrells
patent: 3249752 (1966-05-01), Odle
patent: 3340393 (1967-09-01), Franck et al.
patent: 3398273 (1968-08-01), Rex et al.
patent: 3735124 (1973-05-01), Stahlhut
patent: 4368504 (1983-01-01), Sato et al.

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