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.
Definition of lead. led. play \Ëled\; leading. transitive verb. 1a : to guide on a way especially by going in advance led the officers to his hiding placeb : to direct on a course or in a direction a road leading the traveler to the heart of the cityc : to serve as a channel for a pipe leads water to the house. 2 : to go through : live lead a quiet life.