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.
LED in Electrical Engineering (Él i di) or light-emitting diode. An LED is a semiconductor device that emits light. LED lights are much more efficient, working with only a fraction of the energy needed even by fluorescent lights even though offering much higher luminescence. A 3 digit LED display shows the output voltage of each individual channel. An LED is a semiconductor device that emits light.  A 3 digit LED display shows the output voltage of each individual channel.