I carry a Fenix light (PD22) because it's really small, has useful brightness settings ( 8 - ~250 lumens), but what I really like is that Fenix makes a diffuser tip for it they call a lampshade. It's a clear plastic tip that has a conical reflector (inverse to the reflector in the flashlight) to spread the light in a nice outward and downward pattern. The tip holds the light upside-down via little friction tabs.

I hang the diffuser in the peak of my tarp and then plug the flashlight in when I enter and grab the flashlight when I exit. I like that the flashlight is pointing up, not shining straight down into my eyes.

Also, the diffuser is a less than an ounce and makes it easy to find my flashlight when it's off.