News

Visual sensitivity curve of the eyes

The sensitivity of human eyes in the visible spectrum is not consistent, but changes with wavelength.

When the eyes have adapted to medium and high illumination, their maximum sensitivity is in the yellow-green range at 555 nanometers. It is located in the middle part of the solar radiation spectrum reaching the earth's surface. In solar radiation, wavelengths less than 290 nanometers are absorbed by ozone in the higher atmosphere; wavelengths greater than 1400 nanometers are strongly absorbed by water vapor and carbon dioxide in the lower atmosphere. Therefore, it can be concluded that:

Although the maximum values of the eye sensitivity curve and the daylight spectral power distribution curve are not consistent, the eye sensitivity curve is the result of human adaptation to the light transmittance of the earth's atmosphere during evolution.

PREVIOUS：The economics of lighting: collective replace NEXT：Ultraviolet and infrared radiation