Electric lamp and discharge devices: systems – Time-controlled
Patent
1979-03-28
1981-09-29
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Time-controlled
307141, 315156, 315159, 315307, H05B 4138
Patent
active
042925703
ABSTRACT:
An energy-conserving solid-state-controlled illumination system which operates high-intensity-discharge lamps. The system operates the lamps at about a predetermined rated power consumption with a relatively high light output for a predetermined initial period of time during the initial night when a high degree of illumination is most needed. The system then operates the lamps for a later period of the night at a reduced power for a second predetermined period of time when a lower degree of illumination can be tolerated. Then if the lamps are still energized according to seasonal variations, the system thereafter operates the lamps at the relatively high light output for the remainder of the night to accommodate early morning traffic.
REFERENCES:
patent: 2295894 (1942-09-01), Dewan
patent: 3989976 (1976-11-01), Tabor
patent: 4008415 (1977-02-01), De Avila-Serafin et al.
patent: 4147962 (1979-04-01), Engel
patent: 4209728 (1980-06-01), Membreno
La Roche Eugene R.
Lombard R. S.
Westinghouse Electric Corp.
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