When will the flash light burn? I'm going to buy a Nikon SB800 flash on the Internet, but the lamp holder is burnt. I bought a good one. I want to ask.

Normal use will not burn the flash! Because the flash is triggered by low voltage and the internal high voltage conversion technology has a history of decades, regular manufacturers can master these basic technologies. I have used more than a dozen flashlights of various brands, and there has never been a so-called burning phenomenon. However, flash tubes have a service life. The original electronic flash is called "10,000 flashes", which means that the lamp flashes about 10,000 times, just like the lighting lamp we use every day, almost aging and failing. With the development of technology, the life of flash tube should be more than 10000 times. If you play photography in your spare time, you won't have too many opportunities to use flash, or even you won't use good quality flash for a lifetime.