Application of Mixed Light Optimization of RGBW-LEDs in Solar Simulation

Chen-yu, 熊晨雨 Xiong; Yuxiang, 吴玉香 Wu; Yang, 李杨 Li; Shang-sheng, 文尚胜 Wen

doi:10.3788/gzxb20174608.0823006

Cited by 3 publications

(1 citation statement)

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“…The PWM dimming method is achieved by changing the duty cycle of the LED light source, thereby changing the average luminous flux. The dimming performance is flexible and can accurately control the luminous flux, thereby accurately controlling the brightness change in the LED and reducing the impact of current changes during amplitude modulation on the stability of the light source [23]. In engineering practice, the color difference caused by PWM dimming is often not considered [24].…”

Section: Dimming Methods and Calculation Methodsmentioning

confidence: 99%

Experimental Study on Chromaticity Control in Visible Light Communication Systems

Ke,

Wang,

Qin

et al. 2023

Photonics

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To apply visible light communication systems in different scenarios, this article utilizes an excellent temperature-adjustable light source mixed with RGB LEDs and applies it in a visible light communication system. It uses color division multiplexing technology to achieve three-channel communication, thereby improving the communication bandwidth of the system. The communication system adopts three constant current driving circuits to control the duty cycle of Pulse Width Modulation (PWM) of each channel, thereby changing the proportion of RGB LEDs, and obtaining different color temperatures to achieve the purpose of color control for mixed-color LEDs. The experimental results show that when adjusting the color temperature, the change in luminous flux is very small, with fluctuations of less than 2.24%. When adjusting the brightness, the color temperature fluctuation is within 40 K, which is less than the 50 K color temperature limit that the human eye can distinguish, and the average color temperature error is 0.609%. Color tolerance less than 5.5 × 10−3 indicates good dimming effect, and the communication performance of the system is better in the high color temperature range, which is significantly superior to the low color temperature range. When the error rate is below 3.8 × 10−3, the total modulation bandwidth of the three channels reaches 11.7 MHz.

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Section: Dimming Methods and Calculation Methodsmentioning

confidence: 99%

Experimental Study on Chromaticity Control in Visible Light Communication Systems

Ke,

Wang,

Qin

et al. 2023

Photonics

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show abstract

Change of circadian effect with colour temperature and eye spectral transmittance at different ages

Tian

Chen

et al. 2020

Lighting Research & Technology

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With the recent advances in photobiology research and light-emitting diode technology, considering the circadian effects and the potential health benefits of lighting has attracted much attention. In this work, to achieve a white light-emitting LED cluster with beneficial and tunable circadian effects, a red-green-blue-warm white colour-mixing method based on pulse width modulation has been introduced and developed. Five optimal spectral power distributions were achieved with the correlated colour temperatures of 2700, 4000, 5000, 6500 and 8000 K that provide maximum colour-rendering indices of 95.0, 96.6, 96.8, 95.6 and 93.5 for each correlated colour temperature. Moreover, the Bellia model was modified to take into account the reduction in spectral transmittance of the human eye that occurs with age. Using the five spectral power distributions, based on the eye spectral transmittance with age-related change, we studied the change of the circadian effect with corneal illuminance at the different correlated colour temperatures. Solutions are provided for scenarios where circadian effect should be avoided for different age groups while the reasonable illuminance and colour temperature are maintained.

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Experimental Study on Chromaticity Control in Visible Light Communication Systems

Ke¹,

Wang²,

Qin³

et al. 2023

Preprint

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In order to apply visible light communication systems in different scenarios, this article utilizes an excellent temperature adjustable light source mixed with RGB LEDs, and applies it in a visible light communication system. It utilizes color division multiplexing technology to achieve three-channel communication, thereby improving the communication bandwidth of the system. The communication system adopts three constant current driving circuits to control the duty cycle of Pulse Width Modulation (PWM) of each channel, thereby changing the proportion of RGB LEDs, and obtaining different color temperatures to achieve the purpose of color control for mixed color LEDs. The experimental results show that when adjusting the color temperature, the change in luminous flux is very small, with fluctuations of less than 2.24%; When adjusting the brightness, the color temperature fluctuation is within 40K, which is less than the 50K color temperature limit that the human eye can distinguish, and the average color temperature error is 0.609%; Color tolerance less than 5.5×10-3 indicates good dimming effect, and the communication performance of the system is better in the high color temperature range, which is significantly superior to the low color temperature range. When the error rate is below 3.8×10-3, the total modulation bandwidth of the three channels reaches 11.7 MHz.

show abstract

Application of Mixed Light Optimization of RGBW-LEDs in Solar Simulation

Cited by 3 publications

References 0 publications

Experimental Study on Chromaticity Control in Visible Light Communication Systems

Experimental Study on Chromaticity Control in Visible Light Communication Systems

Change of circadian effect with colour temperature and eye spectral transmittance at different ages

Experimental Study on Chromaticity Control in Visible Light Communication Systems

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