Dimmable lighting device
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United States of America Patent
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Oct 24, 2017
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N/A
app pub date -
Jun 10, 2011
filing date -
Jun 30, 2010
priority date (Note) -
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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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