Abstract: A skin radiation apparatus (10) is described for providing a person's skin in a radiation area (12) of the apparatus with modulated photon radiation (14). The apparatus comprises a photon radiation source (18) for generating the photon radiation and a modulation facility (16) for causing a modulation of the total power density of photon radiation in the wavelength ranges from 300 to 700 nm, from 1900 to 2000 nm and from 2400 to 10.000 nm in the radiation area is modulated between a first and a second, mutually different level with a frequency of at least 0.1 Hz and of at most 10 Hz, wherein the first value is at least 20 mW/cm 2 and the second value is at most one fourth of the first value.

Abstract: The present invention relates to a method for illuminating a scene having an average lighting setting, the method comprising the steps of receive scene information from an image sensor (110) comprising a plurality of pixels, determine chromaticity coordinates for the scene based on the scene information, and determine, based on the chromaticity coordinates, control values used for driving the at least two differently colored light sources (L1, L2, L3), thereby allowing for illumination of the scene without essentially changing the average lighting setting of the scene. The present invention provides for the possibility to in a more precise way match the average lighting setting of the scene, wherein it is possible to produced light that assure a more natural rendering of illuminated objects in the scene.

Abstract: A method of displaying an input signal (IV) on a full color LED display is discussed wherein the display has pixels (11) comprising at least four LED's (PLi) which respectively emit light with four primary colors. The method comprises converting (SC) the input signal (IV) into drive signals for the at least four LED's (PLi). The converting (SC) comprises: (i) determining (RD) valid ranges (VRi) of at least two of the drive signals (DSi) to obtain a color of the combined light emitted which fits the input signal (IV), (ii) determining (LD) a gradation or lifetime indication (LTi) of the at least two LED's (PLi) for associated ones of the drive signals (DSi) within the valid ranges (VRi), and (iii) determining (CD) a combination (DCi) of values of drive signals (DSi) providing substantially the minimum degradation, or the maximum lifetime, of a combination of the at least two LED's (PLi) based on the degradation or lifetime indications (LTi).