Following up on promising results from pilot work, researchers at the VA Boston Healthcare System are testing the effects of light therapy on brain function in veterans with Gulf War Illness. Veterans in the study wear a helmet lined with light-emitting diodes that apply red and near-infrared light to the scalp. They also have diodes placed in their nostrils, to deliver photons to the deeper parts of the brain. The light is painless and generates no heat. A treatment takes about 30 minutes.