>>1416122This is a good reliable one from a well known enthusiast brand. Comes with a good battery and has built in charging... And with a burst mode of 1020lm, it's probably around 5 to 10 times brighter than any normal flashlight he is used to... and it's on sale for $50 so thats good.
https://www.batteryjunction.com/olight-s2r.htmlBut if you want to go crazy and go for insane f-off brightness, this light does all of that, is just a little larger, but will sustain a 4,000lm burst (I've read it's closer to 3.5k) for about 30 seconds before stepping down. But it's $120
https://www.batteryjunction.com/acebeam-ec65-rechargeable-edc-flashlight.html 