It may be because the LED lamp bead does not match the LED driver power supply, the normal single foot 1W lamp bead withstand current: 280-300mA, voltage: 3.0-3.4V, if the lamp bead chip is not sufficient power, it will cause the light source strobe phenomenon, the current is too high, the lamp bead can not withstand a light off, and the serious phenomenon will burn the gold wire or copper wire built into the lamp bead, resulting in the lamp bead is not bright.
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There is also a possibility that the driving power is broken, as long as you change to another good driving power, it will not flash again.