I would probably use green or yellow LEDs, but the white ones should not be a
problem.
I built an LED analyzer/integrating sphere and one of the features is a
circuit that optically measures the LED driver PWM frequency. It can also
detect the minute variance in LED intensity from an LED driven by a 950 kHz
boost converter. It also had no problems with a white LED driven at 4 MHz from
a signal generator. You see the long persistence phosphors mainly in large
lighting LEDs and not in small indicator LEDs.
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