More research is “coming to light” about the effects that light has on our brain. Researchers at the University of Arizona recently studied the effects of green and red LED lights on rats. They found that rats exposed to green light for 8 hours a day for 5 days became less sensitive to painful heat and pressure. With red light exposure, they found the opposite and could show that rats became more sensitive. This effect was completely abolished when the rats were fitted with opaque contact lenses that did not let the light through. Because we think that this is important we will start testing light sensitivity in individuals with chronic pain in an upcoming research study.