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#F00 is vague (there's probably some standard that I don't know). Can you give us a wavelength?
I like short yet visible wavelengths and the shade between blue and green (around about 525nm I believe). So Purple and greenish blue.
Nope, standard hexcode (# FF 00 00 in case its a rendering issue) The Fs mean the highest output of red light, 00 green light and 00 blue light.
Not sure if this is technically correct but I'm certain its more or less right
But is there a precise wavelength that it is supposed to have? Obviously different monitors will display them differently.
#F00 is a shorthand for #ff0000. I understand what you mean but it references a composition of the brightness of three LEDs on a screen not a colour of light which is when using a screen always just red green and blue in varying quantities.
No idea, sorry, maybe you can look it up in Wikipedia or any hexcode color search site/app I think. I have an app and my Hue stuff mainly so I just experiment with that and save whatever I want to use