Koninklijke Philips Corporation N.v.

Philips Lighting Holding B.v.

Tir Technology LP

Marc Salsbury

Ian Edward Ashdown

Shane P Robinson

Hans-Helmut Bechtel

Ingo Speier

Bernd Ackermann

Matthias Heidemann

Christoph Martiny

Duncan L B Smith

Vladimir Draganov

Ian Ashdown

Duncan L Smith

The invention relates to a photo-detector comprising a light sensitive element () and a wavelength converter () arranged in front of the light sensitive element, the wavelength converter being configured to convert light of a first wavelength into light of a second wavelength and to direct the light of the second wavelength to the light sensitive element. The advantage is that a stable reading across the entire visible spectrum may be provided.

Photo-detector with wavelength converter

Methods and apparatus are disclosed for providing combined time-varying light comprising light from one or more light sources (), and determining aspects of light from one or more light sources based on measurements of the combined light. Light sources of one or more colors can be controlled to provide time-varying combined light outputs () using different switching sequences for different light sources, for example according to PWM, PCM, or other modulation methods. By appropriately configuring the timing of the switching sequences, the combined light output can be made to exhibit a plurality of lighting combinations. A broadband optical sensor () can be configured to measure () some or all of the plurality of lighting combinations, and the measurements used to determine light output measurements of portions of the combined light, and optionally of ambient light, by appropriate processing () of the measurements.

Method and apparatus for controlling and measuring aspects of time-varying combined light

Methods and apparatus are disclosed for providing optical emission feedback control for an illumination system comprising mixed light including light from a first light source () and a second light source (). Each light source is driven by a drive current configured using a control and/or modification signal associated with that light source. The control signal in turn can be configured using a modification signal associated with the light source. An optical signal indicative of the mixed light is generated, for example using an optical sensor (), and the optical signal is processed based on a reference signal to provide measurements indicative of light from each light source, which are used for feedback control of the illumination system. The reference signals can be generated locally or based on a corresponding control or modification signal. To provide measurements for a light source, processing () of the optical signal can comprise mixing () and compensation () operations based on control and/or modification signals associated with that light source.

Method and apparatus for discriminating modulated light in a mixed light system

The present invention provides a method and apparatus for determining intensities and peak wavelengths of light. The apparatus comprises one or more pairs of sensing units for sensing the light, a first sensing unit of a pair configured to sense a first intensity of the light in a first predetermined wavelength range with a first predetermined spectral responsivity and a second sensing unit of a pair configured to sense a second intensity of the light in the first predetermined wavelength range with a second predetermined spectral responsivity. The apparatus further comprises a processing system operatively connected to the one or more pairs of sensing units; the processing system configured to determine the intensity and peak wavelength for each of the one or more predetermined wavelength ranges of the light according to one or more predetermined functional relationships between each of the first intensity and second intensity.

Method and apparatus for determining intensities and peak wavelengths of light

The present invention provides a system and method for controlling one or more light-emitting elements which are driven by forward currents to generate mixed light for use, for example, through a luminaire. The system has one or more light sensors for acquiring feedback optical sensor data and a user interface for providing reference data representative of a desired mixed light. The system also has a controller for transforming either the sensor data or the reference data into the coordinate space of the other and to determine a difference between the sensor and the reference data in that coordinate space. The controller is configured to adjust the forward currents during operating conditions so that the sensor data matches the setpoint data. The present invention also provides a system and method that can at least partially compensate certain temperature induced effects when transforming the optical sensor or the reference data.

Luminaire control system and method

The present invention provides a light source, method, computer-readable storage medium and computer program product for optimising one or more illumination characteristic thereof. In particular, the present invention provides a light source comprising four or more light-emitting elements, or groups or arrays thereof, each one of which having a respective predefined emission spectrum which, when combined in accordance with a given intensity ratio, provide illumination at a particular color temperature. This light source may comprise an internal and/or external selection module for selecting one or more illumination characteristics to be optimised, and internal and/or external computing module for optimising drive parameters of the light source to provide the optimised illumination characteristic selected. The light source may optionally be hardwired to operate according to predefined drive parameters selected, using a method, computer-readable storage medium and/or computer program product of the present invention, in order to optimise a pre-selected illumination characteristic.

Light source and method for optimising illumination characteristics thereof

The present invention provides a light source for producing a substantially balanced output at a substantially optimised output intensity. In one embodiment, the light source comprises one or more light-emitting clusters of a first type and one or more light-emitting clusters of one or more other types, each one of which comprising one or more light-emitting elements, such that, when all light-emitting elements are driven to provide a substantially optimised output intensity, the spectral output of the one or more light-emitting clusters of the first type is substantially balanced by the spectral output of the one or more other light-emitting clusters.

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Vancouver, Canada

Marc Salsbury