The first LEDs only emitted red light; it wasn't until 1972 that George Craford developed the yellow LED, with a green LED following in the same decade. The blue LED can also trace its history ...

Blue, red, white, or amber LEDs may cause headaches or trigger migraine in some people. People who have photophobia may be particularly sensitive. Green LED light may be the only color that does ...

Blue light is often used to treat acne ... Photodynamic therapy has been performed using both red and green LED lights to treat skin cancers. After the medication is applied to the skin, red ...

Staring constantly at white light can frustrate the eye, and darker colors like blue and green have limited wavelength ... drivers can withstand in the fog. LED fog lights are one of the most ...