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LIGHTING DEVICE

  • US 20150091451A1
  • Filed: 05/02/2013
  • Published: 04/02/2015
  • Est. Priority Date: 05/04/2012
  • Status: Active Grant
First Claim
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1. A lighting control apparatus comprising:

  • a primary input power connection for connection to a primary power supply;

    a secondary input power connection for receiving secondary power from a secondary power supply; and

    electronic circuitry arranged to control power delivery to one or more lighting devices;

    wherein the electronic circuitry comprises;

    control circuitry for controlling delivery of power from said input power connections to one or more light sources; and

    sensing circuitry configured to sense an external impedance coupled, in use, to the primary input power connection; and

    wherein the control circuitry is arranged to determine a present operating state of the one or more light sources; and

    wherein the control circuitry is arranged to control delivery of power to the one or more light sources in dependence upon the sensed impedance measure and the determined operating state of the one or more light sources.

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