If you want something good and bright for an emergency, you want something with a LOT of throw. That will give you that “spotlight” effect like when you look at the Luxor in Vegas. Something like an MF04, BLF GT, R90C. This would catch the attention of emergency aircraft from a distance.
If you’re talking about during an emergency so you can see in general, 5,000 lumens is more than enough. For looking around in general during an emergency, a proper moonlight mode is much much much more important. It’s your primary source of light and you want it running reliably as long as possible. Even .1 lumens is enough to see what you’re doing in the dark. Something like a D4S or a zebralight with spare cells would be better.