I recently purchased a headlight for spelunking. It has approximately a four hour battery life and is rechargeable. There are three super bright led clusters and it is adjustable. I almost forget I am wearing it, as it is quite comfortable. I tested it by using it in a dark room and being able to easily make out instructions and fine detail. I believe the total cost was $29. This also frees up bench space, as I have no need of alternate illumination. Highly recommended.