Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Patent
1976-11-17
1978-08-01
Smith, Alfred E.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
315310, 315199, 340 46, H05B 41392, H05B 3904
Patent
active
041045629
ABSTRACT:
Power consumption by traffic lights is reduced during the nighttime hours by allowing only part of each cycle of the alternating current to the lights to pass through. A photo conductive cell which is responsive to ambient light intensities controls a timing device which in turn controls the device for allowing current to flow to the lights. Detection devices monitor the proper operation of the devices which allow current to flow through the lights. In the event that an improper operation is detected, an override relay switches full power to the lights.
REFERENCES:
patent: 3500455 (1970-03-01), Ross et al.
patent: 3500456 (1970-03-01), Ross et al.
patent: 3863104 (1975-01-01), Bolhuis
patent: 3885197 (1975-05-01), Moses
Roberts Charles F.
Smith Alfred E.
Traffic Systems, Inc.
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