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 ...

Running lights, for those who may not know, are lower-wattage lights near the headlights that often turn on when the vehicle does. Q: Hello, Honk: What’s the rule on paper license plates?

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.

You would want to stick LED strip lights behind your television to reduce eye strain and blue light emitted from the TV. It also adds some nice ambiance.

Light pollution blues: photographs of London taken on board the ISS in 2012 (left) and 2020 (right). The images show the whitening and brightening of the city. (Courtesy: A Sánchez de Miguel et al / ...