A color temperature control method in the present disclosure includes: obtaining color coordinates and illuminance of each monochromatic lamp, and obtaining, based on the illuminance and an illuminance proportion of a color temperature, initial illuminance data of the monochromatic lamp at a current color temperature; calculating a coordinate difference between target color coordinates and mixed color coordinates obtained by performing illuminance mixing on the initial illuminance data; when the coordinate difference is within a first difference range, calculating illuminance changes of R and B based on the mixed color coordinates, the target color coordinates, correction coordinates of R, and correction coordinates of B; and obtaining latest channel values of R and B based on the illuminance changes of R and B, and regulating, based on the latest channel values, the color temperature of each monochromatic lamp on which color mixing is performed.

An illumination device comprising a plurality of light emitting diodes (LEDs) and a method for controlling the illumination device while avoiding flicker in the LED output is provided herein. According to one embodiment, the method may include driving the plurality of LEDs substantially continuously with drive currents configured to produce illumination, periodically turning the plurality of LEDs off for short durations of time during a first period to take measurements or communicate optical data, and increasing the drive currents supplied to the plurality of LEDs by a small amount when the LEDs are on during the first period to compensate for lack of illumination when the LEDs are periodically turned off during the first period.

An illumination device comprising a plurality of light emitting diodes (LEDs) and a method for controlling the illumination device while avoiding flicker in the LED output is provided herein. According to one embodiment, the method may include driving the plurality of LEDs substantially continuously with drive currents configured to produce illumination, periodically turning the plurality of LEDs off for short durations of time during a first period to take measurements or communicate optical data, and increasing the drive currents supplied to the plurality of LEDs by a small amount when the LEDs are on during the first period to compensate for lack of illumination when the LEDs are periodically turned off during the first period.

A substrate for an LED emitter includes a body with a recess region formed therein. Bonding pads are disposed within the recess region, including LED bonding pads for LEDs and supporting chip bonding pads for one or more semiconductor chips that provide supporting circuitry (e.g., driver and/or controller circuitry) to support operation of the LEDs. External electrical contacts can be disposed outside the recess region. Electrical paths, disposed at least partially within the body of the substrate, connect the external electrical contacts to a first subset of the supporting chip bonding pads and connect a second subset of the supporting chip bonding pads to the plurality of LED bonding pads such that one or more supporting chips connected to the controller pads can be operated to deliver different operating currents to different ones of the LEDs.

The present invention relates to a tooth whitening system (10), comprising a light source (30), a light detector (40), and a processing unit (50). The light source is configured such that a wavelength of the light emitted is adjustable over a wavelength range of operation. The detector is configured to detect light emitted from the light source. The processing unit is configured to control the light source to adjust the wavelength of the light emitted by the light source and determine a measure of absorption light detected that was emitted from the light source as the wavelength is adjusted. The processing unit is configured to utilize the determined measure of absorption to operate the light source at a wavelength at a peak in absorption.

The present invention relates to a tooth whitening system (10), comprising a light source (30), a light detector (40), and a processing unit (50). The light source is configured such that a wavelength of the light emitted is adjustable over a wavelength range of operation. The detector is configured to detect light emitted from the light source. The processing unit is configured to control the light source to adjust the wavelength of the light emitted by the light source and determine a measure of absorption light detected that was emitted from the light source as the wavelength is adjusted. The processing unit is configured to utilize the determined measure of absorption to operate the light source at a wavelength at a peak in absorption.

Inventive methods and apparatus for interactive control of a lighting environment. In some embodiments an interactive system for controlling redirectable lighting in a lighting environment may be provided. In some embodiments systems and methods may be provided that enable the display of adjustable lighting parameters in a virtual environment.

Inventive methods and apparatus for interactive control of a lighting environment. In some embodiments an interactive system for controlling redirectable lighting in a lighting environment may be provided. In some embodiments systems and methods may be provided that enable the display of adjustable lighting parameters in a virtual environment.

A hydroponics lighting system includes a plurality of hydroponics pans. The system includes multiple light sources, each of the multiple light sources being attached to the exterior surface of at least one of the plurality of hydroponics pans and individual light sources emitting different wavelengths of light and a controller configured to individually adjust one or more of light intensity or wavelength output for each of the multiple light sources over time.

A hydroponics lighting system includes a plurality of hydroponics pans. The system includes multiple light sources, each of the multiple light sources being attached to the exterior surface of at least one of the plurality of hydroponics pans and individual light sources emitting different wavelengths of light and a controller configured to individually adjust one or more of light intensity or wavelength output for each of the multiple light sources over time.