Who can tell me the difference between fill light and flash?

The difference between fill light and flash: 1. LED fill light uses LED light-emitting diodes to fill in the light of the subject. LED lights are generally used in camera phones due to their low energy consumption and high brightness. Or on a digital camera, used for fill light when the light is insufficient. Since the brightness of LED light-emitting diodes is much lower than that of a real flash, it can only play a "fill light" role. 2. The principle of LED flash: LED does not emit light through the electron transition inside the atom, but by applying voltage to both ends of the PN junction of the LED, causing the PN junction itself to form an energy level, and then the electrons in this energy level It jumps up and produces photons to emit light. Qualified LEDs should have a service life of about 100,000 hours under rated power. If the mobile phone is designed to drive the LED with a current exceeding the rated current, the LED life will be greatly shortened to thousands or even hundreds of hours.