What i do is make my own. cheap, simple, and sweet. About 1/3 the cost too. There was a web movie file but i don't remember where it was. You just take a thrill fishing light(i think its called nitelight or nitrite), the push kind, and put it in a nock with some glue. Sand the newnock down a bit so it slides in an out with moderate pressure. Cut the old nock in half and epoxy it on the end of the battery so its snug and holds the light/nock in the arrow shaft. They work good for me. Taken three does with one arrow, lights up every time and its really bright!