HELP : - 5 V 3 led stroboscopic flashing lamp

Hello, I post this on this forum, because I have a request that’s I don’t find the answer on internet.
I want to make a stroboscopic lamp for my airsoft gun.
My electronics skills are a bit higher than basics.
I watched a lot of YouTube videos, but none was comporting a 3 led working under 5 V lamp.
Thanks for your attention,

Anthony