LED Energy Efficiency Advances

Power adaptive control method for LED lamps that maximizes brightness and efficiency over temperature and voltage variations. The method involves measuring total voltage input to the lamp, comparing it to a threshold, adjusting lamp bead count, and iteratively fine-tuning PWM duty cycle to maintain constant power. This allows the lamp to operate at optimal brightness and efficiency over temperature and voltage changes. The control is done by a microprocessor that continuously collects lamp parameters and makes real-time adjustments based on optimal operating criteria.

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Controlling LED power supplies to prevent excessive power dissipation and improve lifetime when loads change. The method involves dynamically adjusting the rated current of the power supply based on output voltage. If output voltage exceeds a threshold, the rated current is reduced to limit power below the rated level. This prevents long-term operation at higher power that can degrade supply life.

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Adaptive dimming method for LED power supplies that automatically adjusts dimming levels based on usage patterns. The method involves tracking the startup and shutdown times of the LED power supply. By monitoring power on and off events, it determines the effective running time between starts. This adaptive dimming curve changes over time based on usage patterns rather than fixed dimming levels.

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Dimming control system for high-power light sources that allows smooth and efficient dimming of high-intensity lights like street lamps without strobing, flickering, or EMI issues. The system receives dimming commands and continuously monitors the light source. It dynamically adjusts power based on the command and real-time data to smoothly dim the lights. It also verifies commands, identifies interference, and calculates optimal power adjustments to avoid issues.

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Real-time power-based LED control method, device, and system that enables efficient and safe operation of LED lighting systems. The method involves monitoring and adjusting the power consumption of individual LEDs in real-time to prevent overcurrent and burning. It calculates the required power for each LED based on brightness and operating parameters. If the total power exceeds limits, it reduces brightness to stay within allowable ranges. This allows controlling multiple LEDs in a slave machine to prevent overcurrent compared to traditional methods that only monitor overall power. The real-time power monitoring and adjustment improves reliability and lifespan of LED lighting systems.

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LED lamp dimming controller that provides deep dimming without flicker. The controller converts PWM dimming signals into separate control signals for adjusting peak current and duration. This allows fine grained dimming by separately controlling peak current and energy duration. The peak current control signal adjusts the LED voltage to change brightness at low duty cycles where PWM is ineffective. The duration control signal adjusts the energy delivered. This provides deep dimming without flicker as the LED brightness can be adjusted over the entire duty cycle range.

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Flicker-free LED dimming system and method that provides smooth dimming without strobing at low brightness levels. The system uses a modified PWM dimming technique that allows precise control of the LED output current to eliminate flicker. It achieves this by using a dual-control strategy. At low duty cycles, a separate control signal is generated to accurately count the passing cycles of the PWM signal to fine-tune the output current. At higher duty cycles, the regular PWM signal is used. This prevents current interruptions that cause flicker at low brightness. By transitioning between the two control methods based on duty cycle, flicker-free dimming is achieved across the entire dimming range.

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Hybrid dimming method for LEDs that combines PWM and DC dimming to provide high resolution and high refresh rate LED dimming without losing brightness levels. The method involves expressing brightness as the product of pulse width and current. For brightness levels with 2N bits of PWM precision and 2M bits of DC precision, brightness is increased by stepping DC current and pulse width in sequence. This allows accurately representing all brightness levels without gaps. The method provides high resolution by combining PWM and DC dimming, and eliminates color shift and gray level loss issues of pure DC dimming.

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Balancing brightness of LED lights without exceeding comfortable human visual levels and preventing overheating. The brightness balance circuit connects between the LEDs and power supply. It adjusts the current through each LED channel based on the desired overall brightness to achieve a balanced output. This prevents excessive total brightness by dynamically adjusting the individual channel brightnesses.

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LED lamp driving system that can stabilize operating parameters of LED lamps in branches of a lighting setup without requiring higher voltage from the constant voltage source. It uses a sampling module to collect parameters of a target branch, a power processing circuit with adjustable input power, and a feedback loop to stabilize the branch parameters. The processing circuit adjusts its input power based on the sampling to match the branch requirements. This allows branches farther from the source to have lower voltage drops without needing higher source voltage.

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An LED lamp design enabling high-power LEDs to operate without external heat sinks. The design features a cylindrical transparent housing containing LEDs mounted on a flexible PCB rolled up inside. A thin transparent layer coats the PCB to protect the LEDs. The rolled PCB, along with the LEDs and driver components, is enclosed within the housing, allowing efficient heat dissipation directly into the surrounding air through the transparent housing.

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LED tube lamp with improved thermal management and reliability. The lamp has a glass tube with a diffusive layer. Inside, an LED light strip is attached by glue. The light strip has connecting pads at one end. LED light sources are mounted on the strip. A circuit board with components like a rectifier and filter is stacked against the strip end. The board is partly inside an end cap. This design allows better heat dissipation from the strip and components compared to traditional LED tube lamps.

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LED lighting device design that improves light output and color consistency over different angles. The design uses a lens assembly mounted over the LED, with a gap between the lens and elastomer encapsulant. This allows light to reflect off the lens surfaces instead of being absorbed by the elastomer. A reflector in the gap can further control light direction. The lens can also have features like a recess or scattering element to mix light. This reduces color variations and improves uniformity compared to traditional LED encapsulation.

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Lighting apparatus with improved luminance using LEDs and reflectors, without increasing thickness or light sources. A reflective unit with a spaced area under each LED increases reflectivity and luminance. The spaced area can be defined by an optical pattern layer to replace a light guide plate.

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Balancing voltage drops and power consumption in multi-channel LED systems to improve efficiency and avoid overheating. The method involves adjusting the pulse width and amplitude of the LED current to maintain a constant product of current amplitude and duty cycle. This balances voltage drops across channels while keeping brightness the same. The circuit achieves this by using a single power device per channel to simultaneously adjust current amplitude and width. It also sets a phase offset between channels to reduce voltage ripple and fixes turn-off times to avoid voltage overshoot.

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An LED lighting device that maximizes thermal coupling between the LED and heat sink to improve heat dissipation and reliability. The device has a recessed PCB that surrounds the LED module mounted on the heat sink. The PCB provides electrical control circuitry and the recess allows the LED to directly contact the heat sink.

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Multi-channel LED driving method and circuit to improve efficiency and reduce heat dissipation in LED lighting applications like backlights. The method involves precise current regulation and brightness control for each LED channel. The current regulation circuit adjusts the LED working current based on a comparison of actual and desired brightness. When the desired brightness is reached, the current regulation stops to reduce switch tube on-time and power consumption. The brightness detection monitors LED brightness and compares it to the desired level. If the LED brightness reaches the target, the current regulation disables to avoid overcurrent. This allows precise brightness control while reducing switch tube switching time and power.

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A method and system for controlling current stability in LED lighting applications. The method involves using a separate adjustment circuit connected between the LED light sources and the power supply. This allows providing different constant currents to each LED, unlike traditional LED drivers. A central controller coordinates the adjustment circuit and main LED driver to ensure stable currents for all LEDs.

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Optimizing power consumption of LED lighting systems by dynamically adjusting the duty cycle and peak intensity of the pulse width modulation (PWM) signal used to drive the LEDs. The optimization is done based on the specific light instruction received by the system. Instead of always using the maximum efficiency PWM settings, the system determines the combination of duty cycle and peak intensity that achieves the required light output with the lowest power consumption. This involves predefining optimal PWM values for different light levels.

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Method to maximize efficiency of LED power supplies by dynamically adjusting the output voltage target based on input and output parameters. The method involves calculating the efficiency of the power supply using input voltage, bus voltage, and output voltage. It then adjusts the target bus voltage based on the calculated efficiency to find the optimal bus voltage for maximum overall efficiency. This allows the power supply to dynamically optimize efficiency in different operating conditions.

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Automatically adjusting the power for constant current LEDs in devices like smart lighting systems that have battery backup to prolong battery life during periodic discharge cycles. The method involves using a microcontroller to track battery voltage, set discharge time segments, and adjust LED current levels based on battery health. When the LEDs are discharging, the microcontroller saves the battery voltage. When not discharging, it saves the battery voltage again. By comparing these readings, it can determine if the battery is degrading. If so, it adjusts the LED current levels during discharge segments to lower power. This extends the battery life during periodic discharge by avoiding excessive draw.

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LED lighting system that provides both constant current and dimming capability over a wide input voltage range. The system adaptively adjusts the maximum on-time and current limit values for the LED driver based on the input voltage. This allows optimized dimming schedule and depth while maintaining constant current in a wider voltage range compared to fixed values. The input voltage detection and adaptive parameter setting is done by a separate circuit.

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Adaptive power driving for lighting systems that extends the life of capacitors and reduces power dissipation compared to traditional constant voltage lighting power supplies. The adaptive power driving involves dynamically adjusting the voltage and current supplied to the LEDs based on their actual requirements rather than providing a fixed voltage. This reduces excess power dissipation as heat since the LED driver voltage is tailored to the LED current demand. The technique involves analyzing the LED configuration and controlling switches to activate the LEDs during cycles while determining current requirements. This allows setting the LED driver current control point based on the calculated demand.

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Dimming control for LED lighting that reduces power consumption and extends lifetime compared to conventional dimming methods. The dimming is based on accumulated power consumption of the LED instead of just time or luminous flux. As the LED ages and loses brightness, the dimming rate increases to compensate. This allows maintaining initial light output despite luminous flux decrease. The dimming rate calculation factors in daily usage and expected lifetime.

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LED driving method and apparatus that allows controlling brightness of multiple parallel-connected LED strings using a single output driver. It maintains a constant product of current and duty ratio through LED current control and duty ratio adjustment. This avoids needing multiple output drivers for each string and reduces form factor. The average current through all strings is equalized by setting duty ratios based on the charging current and reference voltage.

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Linear LED lighting fixtures with improved power efficiency, control, and color transition capabilities. The fixtures have a channel design with a lower compartment for wiring and upper compartments that overhang the lower compartment. The LED boards are mounted just below the upper compartment edges to eliminate gaps between fixtures. The fixtures use drive circuits with series LED strings connected in parallel. This allows parallel strings with different voltage LEDs to be mixed. The circuits have power feedback to compensate for LED voltage variations. The circuits also have voltage regulation with PWM or BJT switches to protect the driver IC from high LED voltages. A central unit reallocates power between unused and active LED strings when turning on groups. For color transitions, the unit alters instructions to follow the blackbody radiation curve to avoid pinkish hues.

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Optimizing power efficiency and heat dissipation in high-density LED displays by dynamically adjusting the drive currents based on channel luminance levels. The display has multiple LED channels and a control circuit that maps individual luminance levels to average channel currents. It then selects a group current level that exceeds all channel currents. The circuit configures the channel duty cycles based on ratios of average to group current. This allows efficient driving at lower group currents while maintaining brightness. The shared supply voltage is set based on channel voltages. The group current and voltage are dynamically adjusted frame-by-frame.

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LED control method to improve dimming range of LED lights. It involves using two separate LED drivers, one connected to the LED load and another in parallel, to achieve wider dimming range compared to using just one driver. An MCU coordinates the drivers based on brightness commands. When brightness is low, it sends a signal to the second driver to control the LEDs. As brightness increases, it sends a signal to the first driver. This allows seamless dimming from lowest to highest brightness levels.

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Method to reduce power consumption in LED signs by adaptively using on/off driving and brightness control based on image characteristics. The method involves dynamically adjusting the power consumption control strategy based on the current being used to display an image. If the current is below a threshold, brightness control is used. If the current exceeds a higher threshold, on/off driving is used. For images with large current spikes, a third control type combines both. The threshold values can be adjusted based on the image type to balance power savings and visibility.

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Method and device to steplessly control LED brightness to maintain a constant illuminance level in changing environments. The method involves adjusting the duty cycle of the LED driver based on ambient light readings. A reference duty cycle is set for a target illuminance. The duty cycle is iteratively adjusted by small increments or decrements to match the actual ambient light. This allows LED lamps to adapt brightness in different environments to provide consistent illumination levels.

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Linear LED luminaire design with improved power efficiency, color quality, and dimming capabilities. The luminaire has an elongated channel with a printed circuit board (PCB) inside. The PCB has LED engines at regular intervals. The lower compartment of the channel is open to provide a raceway for wiring. This allows connecting multiple luminaires end-to-end with no gaps. The PCB extends almost to the ends of the channel. This prevents dark spots between luminaires. The luminaire uses drive circuits to set LED currents. The circuits have features like PWM modulation, voltage feedback, and BJT switches to optimize power usage and protect components. A central unit can reallocate power between LED series when some are unused. It also adjusts color transitions to follow the blackbody locus for natural-looking white light.

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Controlling current through LEDs after power supply shutdown to provide predictable dimming and longer lifetime. A controlled module between the LEDs and power converter senses reduced voltage from the converter and takes over current control until stored energy is depleted. This allows gradual dimming and controlled shutoff instead of sudden cutoff when the power supply is turned off.

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Improving energy efficiency of POE (Power over Ethernet) LED lighting by allowing intelligent adjustment of LED brightness. The method involves connecting an LED light group to a POE power supply. A light sensor is connected to an STM32 microcontroller. The microcontroller feeds back the sensor data to the control module, which is a computer or phone terminal. The microcontroller generates a PWM signal to control LED brightness based on the sensor feedback. This allows remote control of LED brightness and adaptive dimming based on environment light levels, improving energy efficiency compared to fixed brightness POE LEDs.

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LED lamp system and control method that reduces instantaneous power consumption of an LED lighting system. The system uses a power supply and LED controller to connect multiple lamps in series via separate data and signal lines. The lamps have their own signal processors. When the controller sends dimming data to a lamp, it initiates its own LEDs. The lamp then triggers the next lamp's LEDs using the signal line. This daisy-chain style dimming avoids all lamps turning on simultaneously and reduces instantaneous power demands compared to simultaneous lamp activation.

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Constant power control method for LED lamps that allows LED lamps to work with consistent power levels when connected to fluctuating voltage sources like mains power. The method involves using a voltage regulating device to adjust the duty cycle and current through the LED lamps, so they draw a constant power regardless of input voltage. The LED lamps are continuously monitored to detect any changes and adjust the current if needed. This prevents fluctuations in luminous flux and extends lamp life. The method uses a display and input device to set the desired lamp power and indicate voltage, current, and power values during operation.

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Energy-saving system and method for improving the light efficiency and life of LED lamps. The system involves using an optimized LED controller to improve the efficiency of the LED lamps. The controller adjusts parameters like duty cycle, resistor ratios, and operating current to optimize LED lamp performance. This reduces wasteful heat generation and improves overall efficiency. It also prevents overcurrent issues that can shorten lamp life. The controller detects voltage, current, and light output to dynamically optimize LED operation based on conditions.

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LED drive circuit, lighting system, and method to accurately dim LEDs while compensating for temperature variations. The circuit dims LEDs by adjusting current based on a voltage generated from the dimming signal. To compensate for temperature, a temperature output unit provides a voltage matching the LED's negative temperature coefficient. This voltage is added to the initial voltage and stored. When dimming, the stored voltage is compared to the added voltage and adjusted to approach. This keeps the dimming curve consistent at different temps.

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LED lighting control system that adjusts the current through the LED module to mitigate energy waste in cold environments where the voltage required to operate the LED increases. The system has a voltage detector to measure the LED module voltage, and a current control unit that reduces the current when the initial voltage or voltage increase exceeds thresholds. This limits excessive luminous flux increase as the cold environment voltage rises. By reducing current in response to the voltage spike, it prevents excessive power consumption without reducing light output.

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Power management system for LED street lights in standalone microgrids that optimizes power supply and extends life using real-time cloud analysis. The system uses a cloud-based AI optimization algorithm to determine the optimal power management strategy for each street light based on factors like weather, solar radiation, battery state, and panel characteristics. This dynamic MPPT control is implemented using a cluster-type LED luminaire that adjusts brightness based on supplied power. The system also includes a DC distribution microgrid with a storage device, controller, and MPPT charger to manage the overall power flow. This allows efficient LED lighting with variable solar power and extends battery life compared to fixed MPPT or static control methods.

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Intelligent LED lighting system with reduced power ripple and intelligent dimming control. The system uses an LED driver with a stage 1 AC-DC converter followed by a stage 2 DC-DC constant current converter. A power meter collects data from the AC-DC converter and sends it to a control module. The control module generates dimming commands based on the power data and sends them to the DC-DC converter. This allows intelligent dimming without ripple since the DC-DC converter can provide stable current. The power meter provides feedback for optimizing power usage.

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LED dimming method and system based on ambient brightness that eliminates the need for additional components like sensors and controllers to dim LED lights. The dimming is achieved by using the PWM signal generator in the LED driver circuit to control the power to the LED lamp. The brightness sensor detects the ambient light level and sends a signal to the PWM generator. The PWM generator then turns the LED lamp on and off at varying frequencies, which creates a voltage change on the LED driver circuit. The driver analyzes this voltage change and adjusts the output power to dim the LEDs based on the ambient brightness. This allows dimming without separate sensors, controllers, or long signal lines.

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An intelligent LED lighting control system that automatically adjusts brightness and power consumption based on occupancy and environmental conditions. The system uses sensors to detect factors like occupancy, light levels, and color temperature in the space. This data is processed by a terminal device to generate reference values for power consumption and brightness. These references are compared to the actual values from the LED drivers and lights to generate control commands. This allows the system to dynamically optimize lighting based on occupancy and environment without manual intervention.

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Dimming control for LED drivers that improves efficiency at low dimming levels without generating excessive noise. The dimming control involves generating an additional adjustment signal that overrides the PWM dimming signal at low duty cycles. This additional signal ensures the transistor switching frequency remains above audio frequencies even at low dimming levels. At higher duty cycles, the adjustment signal is set to 100% to follow the PWM dimming signal.

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LED lamp energy saving control device that enables efficient and centralized energy management of LED lighting systems. The device consists of a main control unit, voltage/current adjustment unit, protection unit, metering unit, monitoring unit, and communication unit. It allows remote control, monitoring, and optimization of LED lamp power consumption by adjusting voltage/current to the lamps. The device communicates with a server to provide data on lamp status, environment, etc. for deeper energy savings. It protects the lamps while enabling centralized control of multiple circuits.

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Controlling multiple LED arrays in a dimmable LED lighting system to allow independent color adjustment of the arrays while preserving the color temperature behavior during dimming. The system has a dimmable driver circuit, a current splitter, and an interface. The driver circuit provides a dimmable output to power the LED arrays. The current splitter receives the driver output and splits it into currents for the arrays. The interface connects to an external control signal. The splitter adjusts the current ratio between arrays regardless of driver output based on the control signal. This allows independently dimming the arrays while maintaining a consistent overall color temperature as in incandescent lights.

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LED light source control device that improves uniformity and brightness of LED lighting. The device uses individual constant current drivers for each LED instead of a central driver. This allows independent current adjustment for each LED. A control module receives a uniformity parameter and generates a driving current scheme for the LEDs based on it. The currents are then adjusted to achieve uniform light output from the LED source. This improves brightness consistency compared to synchronous driving of all LEDs.

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LED driving circuit and method to reduce LED current loss over a wide operating range without requiring precise adjustment of current errors in each range. The circuit uses multiple current mirrors with adjustable magnifications and a brightness controller. The brightness controller adjusts magnifications and the reference current to adaptively scale the LED current as brightness increases. This reduces current loss compared to fixed magnifications. It avoids pre-adjusting errors in each range by dynamically scaling instead.

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A method to maintain consistent LED light output over the lifetime of the LED to prevent degradation perception issues. The method involves using a linearizing power supply that provides a continuous relative light output at or around 1.0, even as the LED output decreases with age. This prevents noticeable light degradation compared to non-linearized supplies where the perceived light output drops significantly before LED failure.

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A method for adaptively adjusting constant power control of LED lamps to optimize brightness and lifespan. The method involves self-regulating the LED lamp power to compensate for voltage variations caused by temperature changes during operation. By dynamically adjusting the voltage in the circuit, it prevents the LED lamp power from fluctuating when input voltage is unstable. This ensures optimal LED brightness and extends lamp life compared to manual voltage adjustment.

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Adaptive dimming of LED systems that provides better dimming control and longer LED lifetime compared to conventional dimming methods. The adaptive dimming is achieved by using LED parameters like photometric response, gamma, aging, temperature to generate the dimming commands. This allows more accurate and predictable dimming across LEDs, compensates for LED nonlinearities, and extends lifetime by optimizing drive levels based on parameters. It involves an LED driver that outputs dimming commands based on LED parameters instead of just brightness levels.

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