Ran a "1200" lumen magicshine clone headlight w/red wide angle filter on it. Total cost $30... Too bad battery that came with it lasts like 1/10 the time it's supposed to... I have other suitable batteries so will try again.

It is bright, crazy bright, but can't mount it well as the pack blocks seat post mount. Thinking of using one of those mounts you see for front forks, but on the rear rack screw to get it out of the way of wheel, frame and disc brake...