Adjustable Color Temperature in LED Lighting: Innovations and Patents

Tunable white light LED device that provides high quality light with adjustable color temperature and enhanced color rendering for applications like circadian lighting. It uses a combination of three LED strings (blue LEDs with phosphor coatings), each with a different color phosphor, to generate unsaturated light of different colors. These unsaturated light spectra are mixed to create a tunable white light that can be adjusted along the black body locus of correlated color temperatures. The device uses a drive circuit to adjust the relative currents to the LED strings and achieve the desired color point.

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Light emitting diode (LED) device that can provide various light spectra and color temperatures. The LED has two separately controllable light-emitting elements. One element emits high color temperature white light and the other emits low color temperature white light. The elements use different phosphors to create a range of colors. The device can adjust the balance of the two elements to produce different white light spectra and color temperatures.

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A chip-on-board (COB) type photoelectric device that integrates two groups of light-emitting diodes (LEDs) for two different color temperature channels into a single COB package. The groups of LEDs are arranged in separate regions on the COB substrate. This allows the device to have adjustable color temperature and brightness by controlling the current of the two LED groups. The LED string lengths and configurations are optimized to avoid color mixing issues even when using an external lens.

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LED lighting fixtures can produce a range of light colors and color temperatures to mimic natural sunlight and adapt to human circadian rhythms. The fixture has separate LED sections for high and low color temperature light, such as cool and warm white. The LED sections have different phosphors to generate distinct colors. The sections can be controlled independently to adjust the overall light spectrum and color temperature. This allows the fixture to mimic natural daylight and create lighting conditions that align with the body's biological clock.

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A hybrid lighting and communications system that uses an orange nanowire LED combined with a blue laser diode to produce high-quality white light with tunable color temperature and good color rendering, while also enabling high-speed optical wireless data transmission. The system achieves data rates over 1 Gbps using on-off keying modulation of the blue laser, while also generating high-quality white light with a color rendering index over 80. The nanowire LED provides color tunability and intensity for the white light, while the blue laser enables high-speed data communication.

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Lighting device with modular light sources that can adjust color and brightness easily. The device has a detachable light source module that connects to a fixed installation base using a separate connection base. The light source module has multiple light emitting units and the connection base has multiple terminals that connect to the units. This allows the units to be split into different power circuits and individually controlled for color and brightness.

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Lighting system for growing plants that provides a desired color of light. The lighting system uses LEDs of various colors to generate light with a specific spectrum optimized for plant growth. The system allows the color of the emitted light to be better controlled for more effective plant growth compared to traditional white or fixed-color grow lights. It also adjusts light intensity based on external light level sensors to maintain desired light levels.

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Precisely controlling a multi-color LED light source to generate white light with tunable color temperature. The method involves operating the LEDs in continuous wave mode and not pulse width modulation. Each LED is run at least 5% of max current to prevent undercurrent. The LEDs emit blue, bluish-white, greenish-white, and red light. These are mixed to generate white light with adjustable correlated color temperature.

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Lighting system using LEDs to provide a desired color of light. The system allows adjustment of the color spectrum to match the needs of plants or other applications. The system can also use external sensors to adjust light intensity and turn on/off lights as needed. The ability to adjust the color, intensity, and timing of the light can optimize growth conditions.

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LED-based solid-state lamp that mimics the shape and light distribution of incandescent bulbs. The lamp uses multiple LED strips arranged around a bulb-shaped form to create a uniform spherical light emission pattern similar to incandescent bulbs. The strips can be customized with LEDs from different bins to achieve a target spectrum or color temperature. The lamp allows efficient heat dissipation without heavy heat sinks. The LED strips are arranged to optimize cooling airflow. The lamp can also have provisions for attaching lamp shades and insect-blocking screens. The LED strips are driven at lower currents for improved efficacy. The lamp can replace various incandescent bulbs while providing a similar appearance and light distribution.

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Lighting system for facilitating the growth of plants that allows the color of the emitted light to be better controlled. The system uses LEDs of different colors, such as red, blue, green, yellow, orange, violet, and white, to provide a full spectrum of light that can be adjusted to optimize plant growth. It includes an external light sensor to provide light level data to adjust the intensity of the lighting system in a greenhouse.

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A tunable white light source comprising multiple light-emitting diode (LED) elements with different color temperatures and light conversion films. The conversion films are stacked on some of the LEDs to modulate their color temperature and brightness. The film comprises a polymer matrix doped with light-conversion particles. When the high color temperature LEDs emit light, the conversion films convert and modify the light's color temperature and brightness. This allows tuning the light source's color temperature and brightness independently.

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LED-based light bulb that replicates the appearance and light distribution of incandescent bulbs using multiple LED strips around a bulb-shaped form. This arrangement allows LEDs to be spaced out over a larger surface area, reducing heat concentration and enabling passive cooling. The strips can be custom selected and mixed to achieve target color temperatures or spectral power distributions. The LEDs can be driven at lower currents to enhance efficacy and reduce heat.

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A lighting system for plant growth that provides precise control over light color to optimize plant growth. The system uses LEDs of different colors to create tailored light spectra optimized for specific plants and growth stages. A controller adjusts the intensity of each LED color based on external light sensors to mimic natural lighting conditions.

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Operating a tunable white LED light source to generate mixed white light with precise color temperature control by avoiding undercurrent operation of the individual color LEDs. The LEDs are operated in continuous wave mode, not PWM, with each LED driven at least 5% of its maximum current. This prevents undercurrent conditions where some LEDs are dim or off, and instead allows precise independent control of each color LED to mix white light with a tunable correlated color temperature.

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LED lighting with high color rendering index (CRI) and adjustable color temperature. The LED array contains multiple strings, each comprising several LED chips of potentially different wavelengths, with each string controlled electronically as a separate channel. Phosphors of multiple types and emissions spectra are dispensed or applied on top of all of the individual LED chips, such that it is possible to have a different phosphor type on each individual LED chip, or on different subsets of the LED chips. The multiple channels allow for each string of LEDs and hence their output color and power to be independently switched on/off and varied in intensity, respectively. This allows the LED illuminator to provide variable or adjustable color temperature (CCT), while maintaining extremely high CRI.

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