<p>Optical radiation comprises of ultraviolet short-wavelength (UV) radiation (100-380 nm = nanometers), visible light at 380-780 nm wavelength and long wavelength infrared (IR) radiation (780 nm to 1 millimeter).<img class="buttons square13 zippy-plus" src="http://www.google.com/images/cleardot.gif" border="0" /></p>