The Mighty Bright Orchestra Light is the latest innovation from Mighty Bright. It contains nine light emitting diodes that can illuminate up to four pages of sheet music. It?s rugged, solid state lighting technology lasts up to 100,000 hours. Powered by three AA batteries or a long AC adapter cord (both included). It will give you up to 16 hours of battery life on the high setting or 24 hours on the low setting and the easy access power switch on top controls the brightness level. Flexible gooseneck allows accurate positioning, and an anti glare shield on the back minimizes glare coming at the audience.