Earlier, and perhaps more basic, LED masks usually provide just one primary colour treatment mode, such as red or blue, ...

Full-face LED masks like this one can cost up to several thousand U.S. dollars. The application of red light can stimulate collagen production and blood circulation, and even reduce signs of aging.

Here are some of the best LED light therapy masks & devices for the face, neck, hands and scalp for treating dark spots, fine lines, wrinkles & acne.

The classic American emergency exit sign—the bold red letters spelling out E-X-I-T—seems at first glance like an unimpeachable bit of sign design. The contrast between the letters and the ...