ApplicationNo. 706567 filed on 07/19/1976
US Classes:250/205, Controlling light source intensity315/144, Plural load devices315/151, Load device irradiating the radiant energy responsive device315/158Radiant energy controlled regulation of the current supply for the load device
ExaminersPrimary: Smith, Alfred E.
Assistant: Moore, David K.
Attorney, Agent or Firm
AbstractAn automatically variable d.c. voltage source supplies a control signal to a dimmer circuit that controls the brightness of a high intensity gas discharge lamp in response to a varying d.c. voltage. The automatically variable d.c. voltage source produces a varying d.c. voltage at its output which is functionally related to the difference between a voltage from a stable reference voltage source and a voltage produced by a photocell circuit which is responsive to the light level of an area illuminated by the lamp controlled by the dimmer circuit. The variable d.c. source includes circuitry for indicating relamping conditions.