If there are tubes around, amber. You use a dual color LED with a shunt for a color selector.
I like the idea of a multi-color (RGB) LED. How about a speaker protection circuit? When the Amp is off (or on stand-by), have it blue. During start-up and the speaker-on delay, have it blinking red. Upon successful start-up and speakers being connected, have it turn green. 
If the speaker protection is tripped, the LED returns to blinking red.
Just my two one-hundredths of a dollar.
If the speaker protection is tripped, the LED returns to blinking red.Just my two one-hundredths of a dollar.
While I agree red is pleasing and timeless, I don't like using it for on/off because so many modern commercial devices use red as the "off" or "sleep" colour, and some other colour for "on". Our 2 big TVs use red for "off" and nothing else for "on", because of course the screen itself is lit.
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How about Multi-color led and make it user selectable like those new car interior lighting
Interior mood lighting | Mazdas247
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White is the least contraversial option to my mind - you could make interchangable coloured filters if you wanted customization. However red is the most restful to the eye, especially at night. Amber is good for this too and often overlooked as an LED colour.
The most important aesthetic to me is that all the LEDs are the same colour (excluding warning lights), and red is common enough that its possible to have separates that match.
In high ambient light green is the most visible as that's the peak of human sensitivity, which
is why 555nm green used in the standard definition of the lumen and lux units. However green always reminds me of old green-screen computer monitors from the 80's!
The most important aesthetic to me is that all the LEDs are the same colour (excluding warning lights), and red is common enough that its possible to have separates that match.
In high ambient light green is the most visible as that's the peak of human sensitivity, which
is why 555nm green used in the standard definition of the lumen and lux units. However green always reminds me of old green-screen computer monitors from the 80's!
Orange or white.
Years ago I bought a lot of purple LEDs that slowly turned pink. I called it the "Burn-in Indicator."
That means it’s time to add more chlorine/bromine. That should turn it back to purple.
That wouldn't work so well for LEDs. Even the white ones tend to emit discrete peaks of low, mid, and high wavelengths that, when combined, are perceived as white(-ish). If you were to put, say, a yellow filter in front of a "white" LED, you wouldn't get much yellow light through.
One of my former coworkers at National had a side-business building LED inserts for classic car taillights. Some of them have a blue dot in the middle of the lens. His unique selling proposition was LED inserts that could make that blue dot light up (as it would with an incandescent bulb). Basically, he had a blue LED in the right spot.
Tom
Junk electronics like Bluetooth loudspeakers - the nastier the product, the brighter he blue LED.
Blue and white LEDs produce a lot of extreme blue, even near UV light that have caused the anti-blue optical lens coating industry
diodes - Cool White LED bulbs: Are they "full-spectrum"? - Electrical Engineering Stack Exchange
Blue and white LEDs produce a lot of extreme blue, even near UV light that have caused the anti-blue optical lens coating industry
diodes - Cool White LED bulbs: Are they "full-spectrum"? - Electrical Engineering Stack Exchange
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