You might like the Sofirn SP36 which was on sale last month. It looks like the sale ended and it's a few bucks more now, but still pretty good:

https://www.sofirnlight.com/products/sofirn-sp36-blf-anduril-2-0-rechargeable-flashlight-5650-lumens-powerbank-output

If you want something insane, you could try web search for Ultimate Stealth Light on CPF. It is a Maglight 3D body modified to house a hand built NiMH pack and a 100 watt slide projector bulb. It's "stealth" because it's designed to look like an ordinary Maglight until you turn it on.

Visible light emitted is around 3K lumens but since it is incandescent, there is also a tremendous amount of infrared emitted, so there are photos on CPF of people literally frying eggs on the lens. Turning it on produces a much greater sensation of brightness than a LED light with the same lumens would produce. I'd probably be willing to part with mine, but would have to check that the battery pack hasn't crapped out, as I haven't used it in years.