Abstract:
Illumination of an environment (180) can be selected based on target colors (166) that the illumination would provide for specific samples. One process for synthesizing the illumination includes repeatedly selecting (630) settings for separate light sources (140) in a luminaire system (100) and determining (650) a difference between the target colors (166) of the samples and apparent colors of the samples under illumination that the luminaire system (100) would produce with the settings selected. The differences thus determined can be used (670) to identify a synthesized illumination, for example, the synthesized illumination that provides a smallest difference. A luminaire system (100) can implement such a process in a luminaire (120) or in a control system (210) for luminaires.
Abstract:
The color of light emitted by an assembled light emitting diode (LED) based illumination device with at least two different wavelength converting materials is automatically tuned to within a predefined tolerance of a target color point by modifying portions of the wavelength converting materials. The color of light emitted from the assembled LED based illumination device is measured and a material modification plan is determined based at least in part on the measured color of light and a desired color of light to be emitted. The material modification plan may further include the location of the wavelength converting materials to be modified. The wavelength converting materials are selectively modified in accordance with the material modification plan so that the assembled LED based illumination device emits a second color of light that is within a predetermined tolerance of a target color point.
Abstract:
One embodiment of a solid-state color-measuring device includes a plurality of photodetectors and a plurality of filters permanently deposited on the photodetectors, where at least one of the filters includes a single colorant layer having a transmission coefficient as a function of wavelength that descends from a maximum value between approximately 445 and 450nm to fifteen percent of the maximum value between approximately 485 and 495nm.
Abstract:
This invention relates to a control system for controlling the light output of a LED luminaire comprising a single color LED group consisting of at least one LED. The control system comprises a spectral filter and a photodetector, which thus receives spectrally filtered light from the LED group. The photodetector generates a response signal which is applied to a control device. The control device controls the light output of said LED group at least partially on the basis of the response signal. The control system further includes an incidence angle limiting device arranged to limit the angle of incidence of the LED light received by said filter.
Abstract:
The illumination system has a plurality of light emitters (R, G, B) and a lightcollimator (1) for collimating light emitted by the light emitters. Light propagation in the light-collimator is based on total internal reflection (TIR) towards a light-exit window (4) of the light-collimator. At least one light sensor (8) for optical feedback is placed outside the light-collimator and is arranged to receive light emitted by the light emitters exclusively through reflection at the light-exit window of the light-collimator. Preferably, the light sensor is placed substantially coplanar with the light emitters. Preferably, a side wall (35) of the light-collimator is provided with a protruding portion (9) for guiding the light reflected at the light-exit window of the light-collimator towards the light sensor. Preferably, the illumination system is provided with a reflector (12). Preferably, the illumination system comprises a holographic diffuser (17). Accurate sensing of the color mixing of light emitted by the illumination system is obtained.
Abstract:
Testing systems and methods for testing a light-emitting device comprising a plurality of discrete light-emitting elements disposed over a substrate, the testing system comprising: a power source for energizing at least some the plurality of discrete light-emitting elements; an imaging system for acquiring an image of at least a some of the energized light- emitting elements during energization thereof; and an analyzer for determining, from the image, an optical characteristic of each of the imaged light-emitting elements.
Abstract:
Die Erfindung betrifft eine Beleuchtungseinrichtung mit mindestens einer Laserlichtquelle (10) und mindestens einem Lichtwellenlängenkonversionselement (13), das dazu ausgebildet ist, von der mindestens einen Laserlichtquelle (10) emittiertes Licht anteilig in Licht anderer Wellenlänge zu konvertieren, wobei zur Überwachung der mindestens einen Laserlichtquelle ein erster Lichtsensor (14) zum Detektieren von nicht konvertiertem Laserlicht auf die Wellenlänge des von der mindestens einen Laserlichtquelle (10) emittierten Lichts abgestimmt ist, und ein zweiter Lichtsensor (15) zum Detektieren von konvertiertem Laserlicht auf die Wellenlänge des von dem mindestens einen Lichtwellenlängenkonversionselement (13) konvertierten Lichts abgestimmt ist.