Method for providing bi-level illumination in a stair well

Details Method for providing bi-level illumination in a stair well Method for providing bi-level illumination in a stair well

2007-09-18

2007-09-18

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Plural load devices

C315S158000, C315S316000, C315S312000, C315S360000

Reexamination Certificate

active

10431704

ABSTRACT:
A bi-level illumination system for power conservation correlated to the needs of a building stairwell, which even during work hours is only nominal functioning as it does as a back-up to elevator-provided access to work areas, and requiring high level illumination during off-hours which also occurs infrequently, by its focused stairwell end use permitting use of occupancy and time clock sensing means control of the high and low levels of illumination without the undue complexity of bi-level illumination systems used in work areas with constantly changing illumination needs.

REFERENCES:
patent: 5015994 (1991-05-01), Hoberman et al.
patent: 5357170 (1994-10-01), Luchaco et al.
patent: 5489827 (1996-02-01), Xia
patent: 5637964 (1997-06-01), Hakkarainen et al.
patent: 5668446 (1997-09-01), Baker

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