Dynamic sparkling lighting device

A lighting device comprising:

• a light mixing chamber at least partially delimited by a first surface of a back panel carrying a plurality of light sources spatially distributed across said first surface and by a second surface of a front panel arranged to be illuminated by said light sources, said second surface comprising light transmissive regions delimiting light exit areas having a higher light transmissivity than the light transmissive regions, said light transmissive regions exhibiting isotropic luminance and light exit areas exhibiting anisotropic luminance when illuminated by said light sources, a light source is visible to an observer only when a light exit area is in alignment with a light source and an observer's eye and
• a controller adapted to individually control said light sources and having a mode of operation in which the controller is adapted to vary the luminous output of a selection of said light sources as a function of time such that the isotropic luminance of the light transmissive regions is time-independent and the anisotropic luminance of at least some of the light exit areas is time-dependent during said mode of operation while the overall luminous output intensity of the plurality of light sources is kept substantially constant, in that the controller further is adapted to adjust the luminous output intensity of at least some of the light sources outside said selection as a function of the number of light sources in said selection during said mode of operation to compensate for increases in the luminous output intensity of the light sources in said selection.