A friend of mine bought a flashlight & used that as his bar mounted light. No idea how it worked though.

Do you want to make your own set of lights? You realize how heavy some of the batteries are... We went down that path a year or so ago & it's not worth the hassles Ian went to an electronics hobby store & purchased the lighting items, batteries etc.

The AMB mag also had an article about making your own lights. I'd be more than happy to scan it & send it to you if you'd like.

If you're going to use the lights all the time for road or dirt, then investing $ into a set might not be a bad idea? If you're doing regular night riding during the year & say a 12hr (ours is at night..) then there's another reason.

Cateye Double shots or Triple shots might be another idea. They're more expensive than ay-ups.