Dimmable luminary featuring colour change during dimming
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United States of America Patent
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Aug 11, 2015
Grant Date -
Dec 4, 2014
app pub date -
Oct 2, 2012
filing date -
Oct 13, 2011
priority date (Note) -
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Abstract
A wake-up lamp system (100; 1000) comprises: a light source (130) having a nominal light output intensity (Lmax); and a control device (110) for controlling the light source, the control device receiving a clock signal from a clock device (120). The control device, when operating in a wake-up mode, controls the light source such that its light output intensity is gradually increased from a minimum intensity value (Lmin) to a maximum intensity value (Lmu) and such that the color point of the light output is gradually changed to travel a predefined chromaticity path, with the position of the color point on said chromaticity path being set as a function of the light output intensity. Said chromaticity path has a starting point having a color temperature between 400K and 1500K associated with the minimum intensity and an end point having a color temperature higher than 2700K associated with the nominal intensity.
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