If you heard me say, ‘red light, green light’, you’d be forgiven for thinking I was talking about the infamous Squid Game ...

The Raspberry Pi contains two LED lights: one red and one green. What exactly is each light's function and purpose, and what does the number of flashes mean?

LED light therapy uses light-emitting diodes for skin treatment. Learn about the skin conditions to use it with and what the side effects are.

Ever seen red and green lights on a helicopter? Learn what they mean and how they help pilots navigate safely in the sky.

The first traffic signals were not red, yellow and green. Here's why they are now.

I have used Red and Green LED’s. When node A is positive green LED glows while when node B is positive, Red LED glows. This indicates polarity of the input d.c voltage . 2) LED as a Continuity tester: ...

They are everywhere, now---but how do they work? Of course you could get a red, green and blue LED and combine them together to make a white light, but that's not how most of them work.

Do you ever wonder why our stoplights designate red as stop and green as go? Me too. In fact, it was my daughter’s question on this very matter that inspired me to do some historic research. In ...