I have an old Coleman 12v spotlight that supposedly put out 800,000 candle power. It’s insanely bright. Funny, I’ve been looking around for a drop-in LED bulb for it, just for giggles. Perhaps something like that might suit your friend’s needs?
Looks like FlashPilot modded one here: 8000 lumen 100 watt HID handheld spotlight conversion.
That’s the exact one that I’ve had all these years. 