In article ,
Cursitor Doom wrote:
On Tue, 22 Dec 2020 23:40:00 +0000, Cursitor Doom
wrote:

On Tue, 22 Dec 2020 19:29:23 +0000, The Natural Philosopher
wrote:

red leds were always a volt and a bit, orange yellow a bit more and
green and blue even more

https://www.circuitbread.com/ee-faq/...different-leds


Ok, I'll have to read that item later due to shortage of time right
now, but I'm harking back over 40 years to the first generation of
LEDs which were used for panel illumination on electronic instruments.
They'd typically draw about 15mA before going phut and were dimmer
than the filament bulbs they were replacing. That's if my memory is
not letting me down, that is.

Oh, and there were only two colours back then: green and red.

If both were in the same enclosure, you could have yellow, too.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle