2d
Glamour on MSNHow to Use an LED Face MaskWhile consistent use is key, more isn’t exactly better. “Overusing an LED face mask can lead to skin irritation, dryness, or ...
2a. These are a blue LED with yellow phosphors; an ultraviolet LED with blue and yellow phosphors (or red, green and blue phosphors); and a device that combines red, green and blue LEDs.
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