Laser research and development has focused on medical uses since the 1960's. Historically, low level lasers (LLL) have been the predominant type of light therapy used, but more recently light emitting diode (LED) has been studied. Results have shown the LED to be effective as a coadjutant treatment for wound healing, inflammation, neurodegenerative disease and pain, including potential for neurosurgical patients. Light emitting diode is a semiconductor light source that uses p n junction which is made of thin heavy layered semiconductor materials. Near infrared (NIR-LED) therapy emits radiation from the near-infrared region of the electromagnetic spectrum, with wavelengths ranging from around 630 nm to 940 nm. William Herschel is credited with the discovery of near-infrared during the early 1800s, while development of industrial uses was not done until the 1950s. Today, NIR radiation is used in night vision goggles, digital cameras, and remote controls for daily activities.