What color is the color of the night?

There were significant differences in the color sensitivity of the cone and rod cells.

Cone cells are most sensitive to the spectral yellow green region. When all the colors are tested in daylight, the yellow green light will be the brightest. But which color is most sensitive to the stem cells? In fact, stem cells do not produce color. If you use a very dark but colored light, your eyes will not see any color. Nevertheless, there is still a difference in the degree of color sensitivity in rod cells. The results show that the rod cell is the most sensitive to blue green light (500m). Then, at night or dark conditions, when the rod body is the main visual cells, the brightest colors will be a blue or blue - green. Therefore, the use of blue light at night, rich light, can improve visibility.