My friends teased me until they tried them and now everyone wants a pair.
Do you use a great big clip on light on your sewing machine? Another cord to be plugged in, or another item to be dragged around when you take a class? No longer needed.
Do you need better lighting on an airplane when you want to do hand work?
How about reading in the car or wanting to do handwork as the sun goes down?
On a personal note, I bring these out at night when I can't sleep and want to read. The light directs only to the book and doesn't disturb Mr. Cactus snoring away.
They clip right on the side of any glasses, and rotate up to 360 degrees for more precision. They are light weight and have the equivalent brightness of a 40 watt bulb. If you've seen any of the new LED flashlights you know how bright the light shines. I'm now an LED fan.
You can google "Veratti Attachable LED light". I also found them under "Encon Attachable LED light". Or you can go to http://www.labsafety.com/ The package comes with 6 lithium batteries.