“It has 100 red LED lights, 62 blue LED lights, targets collagen production, reduces acne and increases smoothness, elasticity and even tone of your skin.” You can use it in different light ...

The blue LED can also trace its history back to the 1970s. These were initially developed by RCA with a view to making a slimline TV, and although a blue LED was developed, it wasn't bright enough ...

One is to combine tiny LED lights that each emit red, green or blue into a single big device. The other is to use only blue LEDs but coat them with a type of fluorescent substance called phosphor.