Dimmable lighting device

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...

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Bibliographic Details
Main Author Radermacher Harald Josef Günther
Format Patent
LanguageEnglish
Published 24.10.2017
Subjects
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
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Summary: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.
Bibliography:Application Number: US201113806289