Mayaki

At the same time, it turned out that it became technologically more advantageous to make these elements not reflective, but working through the light, that is, to use a composite lens proposed by Fresnel to concentrate light (see Fresnel lens). For the simplest modulation of light intensity, it turned out to be expedient to use an assembly of lenses rotating around a source that emits light in all directions and is constant in intensity.

To ensure their optical visibility in adverse observation conditions, beacons are equipped with a strong light source and, as a rule, are equipped with optical devices that serve to concentrate light in given directions and increase the intensity of the light used by the radiation source.

Green Roses are real and they are very special, and very old

Such a designation system was introduced in Europe in 1837 and was called "leading lights" (Eng. Leading Lights).