Lighting system that maintains melanopic lux levels at the eye regardless of distance to user
AssigneeSignify Holding B.V.
InventorsTobias Borra, Lucas Josef Maria Schlangen, Jan Souman, Marcel Lucassen
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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.
Claims18
A light emitting system comprising:
- a lighting device configured to provide light;
- a sensor configured to sense a distance parameter d between the lighting device and a user;
- and
- a control system is configured to control one or more lighting properties selected from a spectral power distribution of the light, and a light intensity I of the light as function of the distance parameter d for maintaining the melanopic illuminance at the user constant within a predetermined range of melanopic lux values,
- wherein the lighting device is comprised in a portable device, and
- wherein the control system is configured to maintain in a mode a value of I/(αdn) constant over at least part of a range of the distance parameter d, wherein I is the luminous power of the light of the lighting device, and wherein 0<α≤1 and 1≤n≤2.
A method of controlling light, wherein one or more lighting properties, including the spectral power distribution and the intensity of the light are controllable, the method comprising:
- providing light from a portable lighting device;
- sensing a distance parameter d between the lighting device and a user;
- and controlling one or more lighting properties selected from a spectral power distribution of the light and a light intensity of the light as function of the distance parameter d for maintaining the melanopic illuminance at the user constant within a predetermined range of the melanopic lux values, and maintaining in a mode a value of I/(αdn) constant over at least part of a range of the distance parameter d, wherein I is the luminous power of the light of the lighting device, and wherein 0<α≤1 and 1≤n≤2.
A light emitting system comprising:
- a lighting device configured to provide light;
- a sensor configured to sense a distance parameter d between the lighting device and a user;
- and
- a control system is configured to control one or more lighting properties selected from a spectral power distribution of the light, and a light intensity I of the light as function of the distance parameter d for maintaining the melanopic illuminance at the user constant within a predetermined range of melanopic lux values,
- wherein the lighting device is comprised in a portable device, and
- wherein the light emitting system is configured to maintain a value of Φmel/(αdn) constant over at least part of a range of the distance parameter d, wherein Φmel is the melanopic flux of the light of the lighting device, and wherein 0<α≤1 and 1≤n≤2.
Dependencies are inferred from the claim text.