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- LED flood lights It is inevitable that the LED driving power supply has AC ripple (mainly conducted by 100Hz input voltage). More important is the strobe caused by LED dimming (brightness adjustment): Generally, the brightness of LED lights is adjusted by pulse width modulation (PWM), that is, the brightness is adjusted by controlling the ratio of on / off time. This kind of strobe is more serious, the frequency of this kind of strobe is relatively high, so the LED light should be used well, everyone pay attention when buying