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LED lamp

  • US 9,080,758 B2
  • Filed: 04/17/2012
  • Issued: 07/14/2015
  • Est. Priority Date: 04/22/2011
  • Status: Expired due to Fees
First Claim
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1. An LED lamp mounted on a lighting fixture, comprising:

  • an LED source portion including a plurality of LED chips;

    an illuminance sensor detecting ambient illuminance; and

    a controller controlling the LED source portion in response to the illuminance of ambient light other than light emitted by the LED source portion on the basis of an output signal received from the illuminance sensor when the LED source portion is in a lighting-up state, whereinthe controller includes;

    a spontaneous light illuminance calculating means calculating spontaneous light illuminance contributed to the output signal of the illuminance sensor by the light emitted by the LED source portion on the basis of a driven state of the LED source portion; and

    an on-off control means turning on the LED source portion when ambient light illuminance obtained by subtracting the spontaneous light illuminance from the output signal of the illuminance sensor is less than or equal to a prescribed threshold and turning off the LED source portion when the ambient light illuminance is in excess of the threshold.

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