Health Effects of Artificial Light

Reginald Davey from Nottingham, UK writes that since the prehistoric era, mankind has used a variety of light sources. The earliest light source utilized was fire, but over the past two centuries electricity has been used and today, electric lighting is everywhere. However, there are concerns that artificial light can affect the health of humans. This article will discuss the subject. How Light Affects Living Organisms All light sources emit both visible light and invisible radiation. The types of radiation include ultraviolet and infrared, and these can be further subdivided into narrower bands corresponding to their wavelength. The sun…