LED is short for light emitting diode, which is a semiconductor light source. LEDs are used as indicator lamps in many devices, and are increasingly used for lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths, with very high brightness. An LED is a Light Emitting Diode, like an electronics diode it lets electricity flow in only one direction. The little wire encapsulated in the epoxy center emits light when electricity flows from the Cathode (positive lead) to the Anode (negative lead). Photons are then released to travel to your eye which are detected by your rods and cones and sent to your brain, no mater what size!! An LED can last 11 years even longer, far out lasting a standard bulb so you see why we use them for Fiber Optics. EagerLED chose the right LED chips, which could improve the chip uniformity. And outsource the package production for the most reliable supplier, then LED lamp raw material quality secured.