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.
Learner's definition of LED. [count] technical. : a device that lights up and displays information when electricity passes through it. â LEDs are often used to show numbers and words on electronic devices such as digital clocks. LED is an abbreviation of âlight-emitting diode.â.