What's the use of a bright flashlight driver?
Because if the battery drives LED directly, the voltage and current of the battery will decrease gradually, which will cause the instability of the light.
The drive panel is automatically adjusted so that the output voltage is stable. The principle of battery storage is based on some chemical reactions. With the use of batteries, the internal chemical reactions are correspondingly weakened, which results in the instability of the output voltage ~!
That is to maintain the current and voltage of the input to the high power LED.