Abstract: The invention provides a light generating system (1000) configured to generate in an operational mode system light (1001) having a spectral power distribution with at least 85% of the spectral power in emission bands (111, 121, 131, 141) in four basic wavelength ranges of each at maximum 50 nm width, of which at least three of the four basic wavelength ranges are selected from a first wavelength range of 445 nm +/?25 nm, a second wavelength range of 518 nm +/?25 nm, a third wavelength range of 579 nm +/?25 nm, and a fourth wavelength range of 633 nm +/?25 nm, wherein the emission bands (111, 121, 131, 141) have full width half maxima of at maximum 25 nm.

Abstract: The invention provides a light generating system (1000) configured to generate in an operational mode system light (1001) having a spectral power distribution with at least 85% of the spectral power in emission bands (111, 121, 131, 141) in four basic wavelength ranges of each at maximum 50 nm width, of which at least three of the four basic wavelength ranges are selected from a first wavelength range of 452 nm+/?25 nm, a second wavelength range of 504 nm+/?25 nm, a third wavelength range of 560 nm+/?25 nm, and a fourth wavelength range of 617.5 nm+/?25 nm, wherein the emission bands (111, 121, 131, 141) have full width half maxima of at maximum 30 nm.

Abstract: A method (200) for making a lighting device is provided. The lighting device comprises a carrier having a side on which lighting elements are to be mounted in a selected arrangement in relation to each other using the surface-mount equipment. The method comprises marking (201) on the side of the carrier, using a marking substance comprising an ink composition, indications of the positions on the side of the carrier where the lighting elements are to be placed in order for the lighting elements to become mounted on the side of the carrier according to the selected arrangement of the lighting elements in relation to each other, wherein at least one of the surface-mount equipment or the marking substance is arranged such that the marking substance is detectable by the surface-mount equipment.

Abstract: The invention provides a light indicator (100) for use in evaluating a quantity of melanopsin active radiation, the light indicator (100) comprising a light indicator element (110) comprising a sensing area (111), wherein the light indicator element (110) comprises a light reflecting element (120) configured to reflect at least part of light illuminating the sensing area (111) having one or more wavelengths selected from the wavelength range of an absorption band of melanopsin in the visible wavelength range and configured to absorb at least part of light illuminating the sensing area (111) having one or more wavelengths in the visible wavelength range outside the wavelength range of the absorption band of melanopsin in the visible wavelength range; and a non-sensing area (130) configured adjacent to the sensing area (111), wherein the non-sensing area (130) has an achromatic color having a lightness in the range corresponding to the lightness of shades of gray.

Abstract: The invention provides a light indicator (100) for use in evaluating a quantity of melanopsin active radiation, the light indicator (100) comprising a light indicator element (110) comprising a sensing area (111), wherein the light indicator element (110) comprises a light reflecting element (120) configured to reflect at least part of light illuminating the sensing area (111) having one or more wavelengths selected from the wavelength range of an absorption band of melanopsin in the visible wavelength range and configured to absorb at least part of light illuminating the sensing area (111) having one or more wavelengths in the visible wavelength range outside the wavelength range of the absorption band of melanopsin in the visible wavelength range; and a non-sensing area (130) configured adjacent to the sensing area (111), wherein the non-sensing area (130) has an achromatic color having a lightness in the range corresponding to the lightness of shades of gray.

Abstract: The invention is a method of determining a color formula for matching a selected color, such that an electronic imaging device is calibrated , and at the same time or in a next step the selected color is measured with the aid of the electronic imaging device, then the measured color signals of the calibration colors are converted to the known calorimetric data and then the color signals of the measured selected color are converted to colorimetric data; and next, the color formula is determined that most closely matches the calculated colorimetric data of the measured selected color. The invention also determines a color formula for matching a selected color of textured materials; determines the color difference of a selected color compared to a standard color sample; and measures a specific attribute of the color appearance, the so-called texture.