Abstract: A method of emitting light from one or more light emitting elements, the method comprising: emitting a first time period of photopic light, followed by emitting a first time period of scotopic light, followed by emitting a second time period of photopic light, and followed by emitting a second time period of scotopic light; wherein a first transition from the first time period of photopic light to the first time period of scotopic light is different compared to a second transition from the second time period of photopic light to the second time period of scotopic light, and/or wherein a third transition from the first time period of scotopic light to the second time period of photopic light is different compared to a fourth transition from the second time period of scotopic light to the first time period of photopic light or a third time period of photopic light.

Abstract: The invention provides a lighting system (1000) comprising:—a lighting device (100) configured to provide light (101);—a sensor (150) configured to sense a user-related parameter selected from one or more of (a) a distance parameter (d) between the lighting device (100) and a user (1) and (b) an eye-activity parameter of the eye (2) of the user (1); and—a control system (200) is configured to control one or more lighting properties selected from a spectral power distribution of the light (101) and a light intensity I of the light (101) as function of the user-related parameter.

Abstract: A method of emitting light from one or more light emitting elements, the method comprising: emitting a first time period of photopic light, followed by emitting a first time period of scotopic light, followed by emitting a second time period of photopic light, and followed by emitting a second time period of scotopic light; wherein a first transition from the first time period of photopic light to the first time period of scotopic light is different compared to a second transition from the second time period of photopic light to the second time period of scotopic light, and/or wherein a third transition from the first time period of scotopic light to the second time period of photopic light is different compared to a fourth transition from the second time period of scotopic light to the first time period of photopic light or a third time period of photopic light.

Abstract: The invention provides a lighting system (1000) comprising:—a lighting device (100) configured to provide light (101);—a sensor (150) configured to sense a user-related parameter selected from one or more of (a) a distance parameter (d) between the lighting device (100) and a user (1) and (b) an eye-activity parameter of the eye (2) of the user (1); and—a control system (200) is configured to control one or more lighting properties selected from a spectral power distribution of the light (101) and a light intensity I of the light (101) as function of the user-related parameter.

Abstract: The invention provides a lighting unit configured to generate white light wherein the white light has a spectral intensity in the visible wherein at least 40% of all photons in the wavelength range of 400-500 nm are found in the wavelength range of 430-445 nm (see also FIG. 1b). The lighting unit may especially be used for increasing alertness of a human while not or minimally suppressing melatonin production of the human.

Abstract: There is provided a lighting system for illuminating a space, the lighting system comprising: at least one light source; and at least one controller configured to: receive an indication of a pre-selected duration of an emission period for which the at least one light source is to emit light; control the at least one light source to emit light for the duration of the emission period, select a first spectrum in dependence on the duration of the emission period, and control the at least one light source to emit the light with the first spectrum during at least part of the emission period. There is also provided a display apparatus, a method and a computer program product.

Abstract: A lighting control device for influencing thermoregulation of a vertebrate is disclosed. In one example, the lighting control device configured to select, on the basis of a predetermined criterion, a particular group of colors of groups having been categorized into groups on the basis of dominant wavelength, where each group of colors is arranged to influence a vertebrate's thermoregulation in a particular manner, and configured to generate a control signal for controlling the dominant wavelength of light emitted from at least one light source in accordance with the selected group of colors. The lighting control device is configured to transmit the generated control signal to said at least one light source for said at least one light source to emit light of the selected group of colors, thereby influencing the thermoregulation of the vertebrate being exposed to the light on the basis of said predetermined criterion.

Abstract: The invention provides a lighting system comprising one or more solid state light sources, wherein the lighting system is configured to provide lighting system light having a correlated color temperature of at least 1700 K and having a S* value of at least 33 in a first setting of the lighting system, wherein the S* value is defined as S*=100*(2*A*+B*)/WS with A* being the spectral power in the wavelength range of 380-440 nm, B* being the spectral power in the wavelength range of 660-780 nm, and Ws being the total spectral power in the wavelength range of 380-780 nm of the lighting system light.

Abstract: The invention provides a lighting system comprising one or more solid state light sources, wherein the lighting system is configured to provide lighting system light having a correlated color temperature of at least 1700 K and having a S* value of at least 33 in a first setting of the lighting system, wherein the S* value is defined as S*=100*(2*A*+B*)/WS with A* being the spectral power in the wavelength range of 380-440 nm, B* being the spectral power in the wavelength range of 660-780 nm, and Ws being the total spectral power in the wavelength range of 380-780 nm of the lighting system light.

Abstract: A lighting control device for influencing thermoregulation of a vertebrate is disclosed. In one example, the lighting control device configured to select, on the basis of a predetermined criterion, a particular group of colors of groups having been categorized into groups on the basis of dominant wavelength, where each group of colors is arranged to influence a vertebrate's thermoregulation in a particular manner, and configured to generate a control signal for controlling the dominant wavelength of light emitted from at least one light source in accordance with the selected group of colors. The lighting control device is configured to transmit the generated control signal to said at least one light source for said at least one light source to emit light of the selected group of colors, thereby influencing the thermoregulation of the vertebrate being exposed to the light on the basis of said predetermined criterion.

Abstract: A lighting control device for influencing thermoregulation of a vertebrate is disclosed. In one example, the lighting control device configured to select, on the basis of a predetermined criterion, a particular group of colors of groups having been categorized into groups on the basis of dominant wavelength, where each group of colors is arranged to influence a vertebrate's thermoregulation in a particular manner, and configured to generate a control signal for controlling the dominant wavelength of light emitted from at least one light source in accordance with the selected group of colors. The lighting control device is configured to transmit the generated control signal to said at least one light source for said at least one light source to emit light of the selected group of colors, thereby influencing the thermoregulation of the vertebrate being exposed to the light on the basis of said predetermined criterion.

Abstract: The invention provides a lighting system (100) comprising a first lighting element (10) and a control unit (50), wherein: a) the first lighting element (10) is configured to provide first lighting element light (11) with controllable lighting intensity, wherein the first lighting intensity can be selected from a plurality of values in the range of 0-I, with I being a predetermined first lighting element maximum intensity; b) the control unit (50) is configured to maintain a first lighting element intensity, during a first predetermined period at an intensity value larger than zero when a general lighting intensity is below a predetermined first threshold level; c) the control unit (50) is further configured to maintain the first lighting element intensity during a second predetermined period at an intensity value a*y*I when the general lighting intensity level is y*I, y being the factor the general lighting intensity is below I, with 0<y<1, the parameter a being a predetermined lighting setting with 0&l

Abstract: The invention provides a lighting system (100) comprising a first lighting element (10) and a control unit (50), wherein: a) the first lighting element (10) is configured to provide first lighting element light (11) with controllable lighting intensity, wherein the first lighting intensity can be selected from a plurality of values in the range of 0-I, with I being a predetermined first lighting element maximum intensity; b) the control unit (50) is configured to maintain a first lighting element intensity, during a first predetermined period at an intensity value larger than zero when a general lighting intensity is below a predetermined first threshold level; c) the control unit (50) is further configured to maintain the first lighting element intensity during a second predetermined period at an intensity value a*y*I when the general lighting intensity level is y*I, y being the factor the general lighting intensity is below I, with 0<y<1, the parameter a being a predetermined lighting setting with 0&l

Abstract: A light emitting arrangement is adapted to produce white output light of a total luminous intensity Itot and having an emission peak in the wavelength range of from 400 to 440 nm, comprising: a first light emitting element adapted to emit light of a first luminous intensity I1 and having an emission peak in a first wavelength range of from 440 to 460 nm; and a second light emitting element adapted to emit light of a second luminous intensity I2 and having an emission peak in a second wavelength range of from 380 to 440 nm, wherein the first light emitting element and the second light emitting element are independently controllable such that I2 can be adjusted independently of I1. The possibility of controlling the contribution of deep blue light allows a natural appearance of a crisp white light source at all emission intensities, and may also be used to enhance perception of contrast.

Abstract: The invention provides a lighting system (100) comprising a first lighting element (10) and a control unit (50), wherein: a) the first lighting element (10) is configured to provide first lighting element light (11) with controllable lighting intensity, wherein the first lighting intensity can be selected from a plurality of values in the range of 0-I, with I being a predetermined first lighting element maximum intensity; b) the control unit (50) is configured to maintain a first lighting element intensity, during a first predetermined period at an intensity value larger than zero when a general lighting intensity is below a predetermined first threshold level; c) the control unit (50) is further configured to maintain the first lighting element intensity during a second predetermined period at an intensity value a*y*I when the general lighting intensity level is y*I, y being the factor the general lighting intensity is below I, with 0<y<1, the parameter a being a predetermined lighting setting with 0&l

Abstract: There is provided a lighting system for illuminating a space, the lighting system comprising: at least one light source; and at least one controller configured to: receive an indication of a pre-selected duration of an emission period for which the at least one light source is to emit light; control the at least one light source to emit light for the duration of the emission period, select a first spectrum in dependence on the duration of the emission period, and control the at least one light source to emit the light with the first spectrum during at least part of the emission period. There is also provided a display apparatus, a method and a computer pro gram product.

Abstract: The invention relates to a system (100) for sensing ambient light intensity, comprising a wearable device (10) with at least one pair of light receivers (20, 22, 23, 24, 25) arranged in two different positions for receiving light from the two different directions, and a control unit (110) configured to determine a directional illuminance based on light intensities of the light received by the pair of light receivers (20, 22, 23, 24, 25).

Abstract: A lighting device comprising a first light source issuing a first beam and a second light source issuing a second beam. Said first and said second light source are dimmable and together issue light with a total light flux. At a mutually equal light flux of the first and the second beam, the glare level of the second beam is lower than the glare level of the first beam. The lighting device further comprises at least one (programmed) controller which, during operation, moderates said dim levels such that in at least a range of the illumination level a ratio of the dim level of the second beam to the dim level of the first beam increases in a gradual manner with increasing total light flux.

Abstract: A user interface, a method, and a computer program product are provided for enabling a user to voice control over at least one setting of an apparatus such as a lighting system. The user interface determines a characteristic of an audio signal converted from vocal input of a user. A first setting of the apparatus is adjusted proportionally to a variation in the characteristic. Another setting of the apparatus may be adjusted on the basis of another characteristic of the audio signal. As a result, the user interface enables the user to control a lighting system over a substantially large or continuous range of output.

Abstract: The invention provides a method for controlled lighting of an area (2) with a lighting system (1). The method comprises providing with the lighting system (1), according to a predetermined time program, general lighting (11) during a predetermined general lighting period and colored lighting (21) during a predetermined first colored lighting period. The time program runs for at least 6 hours. Further, in the method a control unit (30) is applied, configured to control the lighting system (1) according to the predetermined time program.