DIMMABLE LUMINARY FEATURING COLOUR CHANGE DURING DIMMING Russian patent published in 2017 - IPC H05B37/02 

FIELD: lighting.

SUBSTANCE: invention relates to light sources. Wake-up lamp system (100; 1000) comprises light source (130) having a nominal light output intensity (Lmax), and control device (110) for controlling light source, control device receiving a clock signal from clock device (120). Control device, when operating in a wake-up mode, controls 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 colour point of light output is gradually changed, to travel a predefined chromaticity path, with position of colour point on said chromaticity path being set as a function of light output intensity. Said chromaticity path has a starting point having a colour temperature between 400 K and 1,500 K associated with minimum intensity and an end point having a colour temperature higher than 2,700 K associated with nominal intensity.

EFFECT: improved perception of lighting when waking up.

12 cl, 8 dwg