Earlier, and perhaps more basic, LED masks usually provide just one primary colour treatment mode, such as red or blue, although this might be attributed to the fact that red light claims to have ...

Two become one: How to turn green light blue Date: August 10, 2016 Source: Karlsruhe Institute of Technology Summary: The upconversion of photons allows for a more efficient use of light: Two ...

Light affects sleep. A study in mice shows that the actual color of light matters; blue light keeps mice awake longer while green light puts them to sleep easily.