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.
In a computer, a driver is a piece of software that tells hardware how to run on a certain operating system. That means your PC card, DVD drive, video card and other hardware all use drivers to make their operations work. If you're using your computer right now, you probably have a ton of drivers already installed and working.