Dimmable lighting device
First Claim
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, the fourth circuit comprising a temperature-dependent circuit for adapting a ratio of a first power supplied to the first circuit divided by a second power supplied to the second circuit 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.
4 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to lighting devices (100) for producing ultimate light comprising first light of a relatively warm color and second light of a relatively cool color. The lighting devices (100) comprise first and second circuits (1, 2) for producing the first and second light, third circuits (3) for reaching a temperature per intensity state of the ultimate light, and fourth circuits (4) thermally coupled to the third circuits (3) and comprising temperature-dependent circuits for giving the ultimate light a, for example, relatively warm color at lower intensity states and for giving the ultimate light a, for example, relatively cool color at higher intensity states. To this end, the third circuits (3) may comprise resistors (31) and/or diodes (32) and/or zener diodes (33), and the temperature-dependent circuits may comprise negative temperature coefficient resistors (41) connected in parallel to the first circuits (1) or positive temperature coefficient resistors (42) connected in parallel to the second circuits (2). Such a lighting device (100) may provide black body line dimming.
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Citations
16 Claims
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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 comprising
a 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, and a fourth circuit thermally coupled to the third circuit, the fourth circuit comprising a temperature-dependent circuit for adapting a ratio of a first power supplied to the first circuit divided by a second power supplied to the second circuit 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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15. A method 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 method comprising
via a first circuit, producing the first light, the first circuit comprising at least one first light emitting diode, via a second circuit, producing the second light, the second circuit comprising at least one second light emitting diode, via a third circuit, in the first state, reaching a first temperature and, in the second state, reaching a second temperature higher than the first temperature, and via a fourth circuit thermally coupled to the third circuit, the fourth circuit comprising a temperature-dependent circuit, adapting a ratio of a first power supplied to the first circuit divided by a second power supplied to the second circuit 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.
Specification