Mostly I use tiny LED blinkies, but I also cary this little flashlight which is small and light enough to affix to my bars with a rubber band when I need a good solid beam. It uses 4AAA batteries, and it really packs a punch casting a beam 68m, but the burn time is not so good. they have a larger light that uses 4AAs that casts a beam 100m, and burns 5x as long. I use one of those big long red rubber bands looped around the light and the bars a few times to hold it in place.