A = consistent, good-quality patient-oriented evidence; B = inconsistent or limited-quality patient-oriented evidence; C = consensus, disease-oriented evidence, usual practice, expert opinion, or case series.
An LED driver is the power supply for an LED system, much like a ballast is to a fluorescent or HID lighting system, says Al Marble, manager - sales & market development for Philips-Advance Transformer.
A device driver is software that allows hardware devices to operate the way they should. For example, a printer driver tells the printer what to do and how to do it. It confirms the connection between the device and the computer itself that allows the computer user to do those things he expects the device to do.