Abstract
A LED-based illumination system with unique feature of instant color variability was fabricated after analyzing the working principle and designing the optical structure of the system.The driving circuits realized constant-current drive and PWM dimming by using IC MAX16807.The experimental results show that the irradiance,the dominant wavelength and the chromaticity coordinate are stable;the uniformity of irradiance distribution is above 90%.Finally,a good image result was obtained and this illumination system was proved to be suitable for color vision measurement.
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