The tail light refers to a white light that is placed as close as possible to the stern of the ship and displays uninterrupted light. A horizontal arc of 135° is displayed within 67.5° from the rear of the ship to each side. The visibility distance is 3 and 2nmile as required by the captain. It is used to display the dynamics of the ship and distinguish the dynamics of other ships, and for judging the situation of the ship crossing or chasing.
Classification of car tail light sources
Incandescent light source
Incandescent lamp is a kind of heat radiation light source, which relies on electric energy to heat the filament to incandescent and emit light. The light emitted is a continuous spectrum. The traditional car tail light with incandescent lamp as the light source is mainly composed of 4 parts: incandescent light source, single parabolic reflector, filter and light distribution lens. The incandescent lamp has a simple structure and is easy to use. It is the most commonly used light source with stable output and little change with ambient temperature.
led
The principle of the light-emitting diode is that when the junction diode is in a forward bias state, the electrons in the N region and the holes in the P region cross each other through the PN junction, and the electrons and holes recombine to emit light.
Neon light source
The luminous principle of neon light source is to apply an electric field at both ends of a discharge tube filled with inert gas to produce continuous discharge. In this process, the excited noble gas atoms release photons to emit light when they return to the ground state, and are filled with different noble gases to emit different colors of light.