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DIMMABLE LIGHTING DEVICE

  • US 20130093323A1
  • Filed: 06/10/2011
  • Published: 04/18/2013
  • Est. Priority Date: 06/30/2010
  • Status: Active Grant
First Claim
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1. A lighting device for, in a first state, producing ultimate light having a first intensity and for, in a second state, producing ultimate light having a second intensity higher than the first intensity, said ultimate light comprising first light having a first color temperature and second light having a second color temperature higher than the first color temperature, the lighting device comprisinga first circuit for producing the first light, the first circuit comprising at least one first light emitting diode,a second circuit for producing the second light, the second circuit comprising at least one second light emitting diode,a third circuit for, in the first state, reaching a first temperature and for, in the second state, reaching a second temperature higher than the first temperature, anda fourth circuit thermally coupled to the third circuit, a ratio being equal to the first power supplied to the first circuit divided by the second power supplied to the second circuit, the fourth circuit comprising a temperature-dependent circuit for adapting the ratio such that the ultimate light of the second intensity has a second ultimate color temperature different from a first ultimate color temperature of the ultimate light of the first intensity.

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