Map Guestbook Search Home Light Light is part of the energy spectrum and is composed of wavelengths of varying lengths. The visible light region is between ultraviolet and infrared. Ultraviolet and infrared radiation are invisible to humans. Various light sources contain different percentages of UV, visible and infrared light.
Daylight contains all three.
Fluorescent lights usually combine UV and visible light energy. Tungsten lights usually combine visible and infrared light energy. Newer bulbs vary in the wavelengths they emit. Some halogen lights emit enormous quantities of ultraviolet radiation. Different types of materials are adversely affected at varying rates by light, UV and IR radiation.