Let's explore what the red and green LED lights mean ... additional LED lights to be aware of. The extra LEDs include two green lights and a yellow light, all of which are related to the Raspberry ...

Well, in the 1840s the British railroads adopted a flag, lamp and semaphore signal system where red meant danger, white meant safety and green indicated ... high endurance LED lamps which give ...

As sales of at-home LED light devices continue to rise, searches for "green light therapy vs red light therapy" are up on ...

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 ...

Editor’s note: We have corrected the post to note that the TriChroma LED TV does in fact use a color filter. We’re gonna admit it. The new Hisense TriChroma LED TV took us by surprise here at ...