Ballast & Driver
            Ballasts and drivers are devices, other than the 
lamps themselves, that convert raw power into a form suitable for a 
light source. 
Devices include electronic and electromagnetic 
ballasts in interior and exterior fluorescent, high-intensity discharge 
(HID), and low-pressure sodium (LPS) lighting systems. 
Products 
are essential in transformers and other conversion devices employed in 
the operation of low-voltage lighting systems, light-emitting diodes 
(LED), and organic light-emitting diode (OLED) drive circuits and power 
supplies for electrodeless lamps.