I love this light. I have used it for stringing work regularly for the past five years. In the past I could see the holes in the frame to snake the string through even in low light conditions, but in the past few years I've noticed I needed more light. It doesn't help that the lighting in the stringing room is not ideal, so this is my solution. I either clip it on my hat or just point it to the place I need to get a good view. I've had this light for probably close to a decade, not sure. But it is a trooper. It works and has made my life easier.
This one LED version of the hat clip light is ideal for such purposes. It probably has a lithium battery that means in general it will last forever unless I leave it on and run it down. Since I only use it periodically it may be a lifetime light. I highly recommend it.
The one shown below is a 3 LED version so it is much more expensive than the one I have. You can probably find the less expensive one at Wal Mart or a hardware store.