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A light emitting diode does not conduct in both directions.
There are 142 light sources. The types of light forms are Natural which are Celestial and atmospheric light, terrestrial, and nuclear or high energy related. Other categories are direct chemical, electric powered, electron stimulated, incandescent lamps, electroluminescent lamps, gas discharged lamps, high intensity discharge, laser, combustion, nuclear, and others.
Electrons move across the terminals of a filament in a light bulb in one direction for 1/120th of a second, and they move in the opposite direction for the next 1/120th of a second. Yes, electrons through a light bulb flip direction 120 times every second.
A light emitting diode - LED.
There is no information available on where Richard Spikes went to school. He is the inventor of the signal light.