Near-infrared light (around 850nm) penetrates deeper into tissue and muscle, helping with joint pain and recovery. Is there a difference in the quality of red light therapy devices?

Valued for portability and low cost, fNIRS has a major drawback: it can't see very deep into the brain. Light typically only reaches the outermost layers of the brain, about 4 centimeters deep ...

Using passive design approaches that require no additional energy, the firm is finding innovative ways to bring more natural light deeper into office buildings. [Photo: Robert Benson/courtesy CBT ...