Why do so many old displays/indicators particularly use red lights? Are/Were white diodes harder to create?
In: 372
On the subject of light, but not necessarily LED’s, red light is much less detrimental to your night vision because it’s wavelengths are so long. Blue light has a much higher frequency and can penetrate your eyelids when you close them. This is one of the reasons that many of the newer phones and even Windows have either a blue light filter or a “night time mode” that softens the light and can help decrease eye strain.
It’s not that white was harder to make, red light has the lowest wavelength so it’s easier to look at from far away and in smokey/foggy situations
Latest Answers