View Full Version : Why green?

kayden azagthoth
07-03-2001, 01:37 PM
Does anyone know why so many LED lights are green? The LEDs on my keyboard are green, and on the power light on my computer tower, and on the CD drive, and on the monitor, and on my cable modem, and on my speakers. The green light is everywhere!! http://www.PCGuide.com/ubb/biggrin.gif

Why green? Is it the cheapest color? Is it the most eye-appealing color? Was there some sort of survey done to rule that green be the color of most LED lights?

Or am I the only one that has thought about this? Please say I'm not alone! http://www.PCGuide.com/ubb/rolleyes.gif

And all you touch and all you see, is all your life will ever be.

-Pink Floyd

07-03-2001, 01:57 PM
Hi Kayden,

I think it might be fashioned on the traffic light principle.

Green means All Systems GO.


Big Blue 66

Woe is me.

07-03-2001, 03:44 PM
Greets --

The human eye is most sensitive to green -- green is right in the middle of the wavelengths that the eye responds to -- maybe that gives you the brightest perceived light with the least power?

Grins --


07-03-2001, 06:50 PM
Because green looks best reflected off a mirrored disco ball. http://www.PCGuide.com/ubb/biggrin.gif

Or maybe because red freaks people out. ("Something's wrong! The red light is on!")

He thrusts his fists against the posts but still insists he sees the ghosts.

07-03-2001, 07:41 PM
I think for a long time the only colors you could get where green,red,yellow,and orange. Since yellow and orange don't 'mean' anything, that left only green and red.

So mabey they just tossed a coin http://www.PCGuide.com/ubb/biggrin.gif

Besides I seem to remember some of the early PCs had red lights on thier power buttons. Was is the TRS-80?

Comment heard from a Klingon programmer.

"Our users will know fear and cower before our software! Ship it! Ship it and let them flee like the dogs they are!"

07-03-2001, 09:41 PM
I had an older AT case with a red hard drive light and I just bought an ATX case a few months ago with a red led for the hard drive, so they're not entirely gone...

I think the opinions posted already probably explain the green choice, but also if you have two colors, then you have to have to stock and maintain two separate supplies of leds and have to make sure they get installed in the right place, so it was probably just for sake of simplicity that they went with just one color...

When all else fails, read the instructions.

07-07-2001, 12:37 AM
Maybe this is *way* old info, but I remember reading that some LED colors are much easier to produce than others, depending on the frequency of light you're trying to achieve. There are colors where it's much more practical to just throw a colored film over the light. Now I'm guessing, but maybe the lower the frequency the easier it is to produce? But that would make red the most common, not green. (And I think red *was* the most common, back in the day.)

It must be what everyone else said: green's a more appealing/less appalling color.


07-07-2001, 02:53 AM
i'm going to throw my 2 cents in here as well; from what i remember on biology and the psych classes-red is a common danger signal for animals, and humans, it's much more attention geting than say lavendar or orange, whereas the blue spectrum ( which includes green ) generally signals a state of calm and soothing to the eyes. This link has some good info, maybe it'll help answer your question. http://www.PCGuide.com/ubb/biggrin.gif


"Soap and education are not as sudden as a massacre, but they are more deadly in the long run."

07-07-2001, 11:06 AM
cause that's the color of your $$??


nice post.. who says I'm the only one without a life??



homepage (http://www.seanweb1.homestead.com/3.html)

[This message has been edited by sea69 (edited 07-07-2001).]

07-08-2001, 12:56 AM
Oh yeah baby! Where can I get some of those lavender LEDs http://www.PCGuide.com/ubb/cool.gif

He thrusts his fists against the posts but still insists he sees the ghosts.

kayden azagthoth
07-08-2001, 03:25 PM
It may be the color of your $$ sea...but not mine! We got multi-colored money up here in Canada, eh. Our $5 is blue, $10 is purple, the $20 is actually green, $50 is red, $100 is goldish/copper, and I think the $1000 is pink, although I've never had my hands on one! http://www.PCGuide.com/ubb/biggrin.gif

Oh yeah, and we don't have one or two dollar bills either. They're coins. The one dollar is called a Loonie and the two dollar coin is the Toonie.

Just thought ya'd like to know that in case you didn't know! lol http://www.PCGuide.com/ubb/biggrin.gif

And all you touch and all you see, is all your life will ever be.

-Pink Floyd