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Like Kilohoku said, the cause is probably in the circuitry that quickly switches the LED on and off to get the desire brightness, or in the power circuit if it is using PWM to generate the required voltages. Edit - Or, if the LED's are actually red and green and quickly switched to create yellow, it is probably in the circuitry that reverses the polarity of the LED's to create yellow.
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What are you pretending not to know ?
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