I've been looking all over for a simple clip-on light to illuminate sheet music on my music stand. Most everything I've found has been a heavy, hot, incandescent bulb that requires an extension cord.
I saw a clip-on, battery-powered LED light called Maestro in the April issue of Guitar Player and it looks perfect! The Kentucky
based company, Q-Lighting, makes a bunch of LED clip-on lights, including a nifty light that clips to the bill of your baseball hat.