Blue Light Vs. Red Light (opens in new tab)

There is an epic fight unfolding between the light side and the dark side of, no, not the Force, but the light spectrum itself. You will have seen the countless gadgets claiming to heal you with red light—the creepy masks full of LEDs, the therapeutic light boxes, even the full-body infrared saunas. Red light, we are told, has health benefits. I will be using the term “red light” for ease of reading, but technically the claim is being made about a portion of the light spectrum, both visible a...