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 light emitting diode (LED) is a solid-state light source, consisting of semiconductor materials that are doped to form a p-n diode junction. When biased in the forward direction, charge carriers, i.e., electrons and holes, flow into the junction, where they recombine while releasing energy in form of a photon.