Visible radiation

Visible radiation, or light, is the visible part of electromagnetic radiation. Its frequency ranges from 3.9 x 10 14 Hz to 7.9 x 10 14 Hz. The wavelengths correspond to the interval 390 nm - 760 nm.

The effect of visible radiation on the organism
Visible radiation acts on the organism through various mechanisms. Short-wavelength components (blue and violet areas) cause photochemical effects, which can manifest themselves on the skin especially in more sensitive people ( photodermatosis ), in certain diseases ( porphyria ), or after administration of certain drugs ( sulfonamides ). The red area, with its effects close to infrared radiation, has a thermal effect, which can cause the body to overheat.

Of course, light also affects the periodicity of vital functions (body temperature, blood pressure, sleep, hormonal and metabolic processes). Psychosomatic effects depend on the intensity and quality of light, the effect of colors on the psyche and perception of the surroundings is also known.

Visible light in therapy
Usage is not great. The interest in light falls more into the field of lighting hygiene, which deals not only with the lighting of workplaces and households, but also its effect on the human psyche. Visible light is used, for example, in the treatment of depression.

Related Articles

 * visible light
 * cutaneous porphyria
 * infrared radiation
 * electromagnetic spectrum