Strobe discs are typically used with some kind of an electric light powered by AC current. Flashlights won't work, and most users do not pay up for a calibrated strobe flasher. The AC-powered electric light will flutter or blink at twice the AC frequency. The 60 Hz driven light will flutter faster than the 50 Hz driven light, and so the dot spacings on the strobe disc need to be spaced closer together for 60 Hz.
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