Welcome to the new and improved Proflex / K2 Tech Forum!
I wouldn't recommend regular flashlights unless the non-technical sections are REALLY non-technical. I lost a lot of skin off of my left arm a few years back doing just that! The "shadow" behind a clump of grass turned out to be the side of the mountain dropping off, and I had ZERO warning before my bike went out from under me. Kind of embarrassing as I was on a date at the time, but you live and learn!
Helmet lights are the best, that way the light is where you are looking, not where your bars are pointing.
I've got a 15W flood for my helmet and 2 spot lights for my handlebars.
: That's interesting. I've got them the other way around. Since I can't point the handlebars as much as I can the helmet, I prefer to have floods on the bars.
Am also experimenting with dinky old dynamos to charge up batteries on down hill stretches- it's a work in progress .