Electrons only flow in one direction in a LED, because it is a diode.
The wonderful thing about most types of LED's is the fact that they require little power, and don't heat up like bulbs do. LED's will last for decades if handled properly. Some LED's are very bright, far brighter then any bulbs of equal size. Most LED's operate anywhere from 1.0 Volts to 7.0 Volts, and current value ranges from 10 to 60 milliamperes. If this is new to you, read on.