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Stoplights are different color greens all the time, go from state to state and you'll see. But all of these systems glow the exact same green.
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That's because they use different sources of light. The new LED lights are a different color green than the older ones that use bulbs (not sure exactly what kind) and then there's those neato ones that look really dark until you're right infront of them when you can see what color they actually are (I think they use some sort of polarization/reflecting thing for that).
All your electronic devices have the same color because there's an established method that does the job cheaply and efficiently, so nobody bothers to try and find a different way to do the same thing.
Jam it back in, in the dark.