# US 2018/0027637 A1 · Lighting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0027637 A1 - Document ID: US20180027637A1 - Status: Published application - Kind: A1 - Application number: 15/550,937 - Filed: 2016-02-12 - Published: 2018-01-25 - Earliest claimed: 2015-02-17 - Assignees: Philips Lighting Holding B.V. - Applicants: Philips Lighting Holding B.V. - Inventors: RALPH KURT; WIEBE WAGEMANS; DRAGAN SEKULOVSKI - Web page: https://patentgrep.com/patent/US20180027637A1 ## CPC - H05B 45/20: Controlling the colour of the light - H05B 45/327: Burst dimming - H05B 47/115: by determining the presence or movement of objects or living beings - H05B 47/16: by timing means - G09F 13/02: Signs, boards, or panels, illuminated by artificial light sources positioned in front of the insignia - Y02B 20/40: Control techniques providing energy savings, e.g. smart controller or presence detection - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract The present invention relates to a lighting device for illuminating a target object with the objective to draw a person's attention to this target object. It alternatingly provides a relatively fast dynamic light output component and a relatively slow dynamic light output component, the former being predominantly for triggering a person's attention towards a target object, while the latter is mainly for enhancing the visual appearance of the target object, thereby keeping someone's attention for that object. For this purpose, the lighting device is arranged to provide a primary light output alternatingly comprising a first light output component and a second light output component. The lighting device comprises a switching controller for switching between the first light output component and the second light output component after a time interval. The primary light output has a perceived light intensity that remains constant over time within a margin of 10%. Each of the first and second light output components is characterized by a light output characteristic. The light output characteristic for the first light output component varies over time according to a first waveform, and the light output characteristic for the second light output component varies over time according to a second waveform. Each of the first and second waveforms is characterized by a time constant. The time constant has a first value for the first waveform and a second value for the second waveform, the first value being lower than the second value. The time interval for switching between the first and second light output components is between 0.1 seconds and 30 seconds. ## Claims ### Claim 1 A lighting device for providing a primary light output alternatingly comprising a first light output component and a second light output component, wherein the primary light output has a perceived light intensity that remains constant over time within a margin of 10%, wherein each of the first and second light output components is characterized by a primary light output characteristic, which varies over time according to a first waveform for the first light output component, and according to a second waveform for the second light output component, wherein each of the first and second waveforms is characterized by a time constant, which has a first value for the first waveform and a second value for the second waveform, the first value being lower than the second value, and wherein the lighting device further comprises a switching controller for switching between the first light output component and the second light output component after a time interval that is between 0.1 seconds and 30 seconds. ### Claim 2 (depends on 1) The lighting device according to claim 1, wherein the first and second values of the time constant are different by at least a factor of two. ### Claim 3 (depends on 1) The lighting device according to claim 1, wherein the time interval for switching between the first and second light output components is between 0.5 seconds and 10 seconds. ### Claim 4 (depends on 1) The lighting device according to claim 1, wherein the switching controller is arranged to vary the primary light output characteristic for the first and second light output components. ### Claim 5 (depends on 1) The lighting device according to claim 1, wherein the switching controller is arranged to switch between the first and second light output components via an intermediate light output component. ### Claim 6 (depends on 1) The lighting device according to claim 1, wherein the switching controller is arranged to switch from one light output component to a subsequent light output component at a moment of switching such that the primary light output characteristic is identical for both components at the moment of switching. ### Claim 7 (depends on 1) The lighting device according to claim 1, wherein the switching controller is arranged to switch from one of the first and second light output components to the other during a transition time of at least 100 milliseconds according to a sinusoidal or sigmoidal transition curve. ### Claim 8 (depends on 1) The lighting device according to claim 1, wherein the primary light output characteristic is color rendering index. ### Claim 9 (depends on 8) The lighting device according to claim 8, wherein the first and second light output components have a color point that remains constant over time within a margin of 10 SDCM. ### Claim 10 (depends on 1) The lighting device according to claim 1, wherein the switching controller is arranged to receive a presence detection signal, and wherein any of the first value of the time constant, the second value of the time constant, and the time interval for switching between the first and second light output components is dependent on the presence detection signal. ### Claim 11 (depends on 1) The lighting device according to claim 1, wherein the lighting device is for illuminating a target object in a retail environment, wherein the switching controller is arranged to receive a control signal representative of an advertisement medium linked to the target object, and wherein any of the first value of the time constant, the second value of the time constant, and the time interval for switching between the first and second light output components is dependent on the control signal. ### Claim 12 (depends on 1) The lighting device according to claim 1, wherein the switching controller is arranged to receive a sound trigger signal or a tactile trigger signal, and wherein any of the first value of the time constant, the second value of the time constant, and the time interval for switching between the first and second light output components is dependent on the sound trigger signal or the tactile trigger signal. ### Claim 13 (depends on 1) The lighting device according to claim 1, further comprising an ambient light sensor for providing a control signal to a controller for adjusting any of the first value of the time constant, the second value of the time constant, and the time interval for switching between the first and second light output components based on the ambient light level.