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The authors have investigated the effect of thermal cycling on the output intensity, peak position and chromaticity coordinates of a high-power AlGaInP light-emitting diode (LED) driven under pulse-width modulation (PWM; pulse width of 200 μs to 20 ms at a constant repetition frequency of 50 Hz) and pulse-frequency modulation (PFM; repetition frequency of 50??5000 Hz at a constant pulse width of 200...