I get from this excellent post, that it would be beneficial to allow an rgb type selection for the hud colour, so that those of us who play in the dark (all of us?) can set the hud to a low grey colour, with a little red maybe.
What is also important is the varying quality of monitors in use. I use a 144Hz monitor for my centre display, which is FAR clearer, especially in motion than my 2 lateral 60Hz displays.
We could also consider the possibility of creating overlay applications that mask the colours of the ED HUDs (and provide a direction assist for docking with guns stowed, sshhh).
What is also important is the varying quality of monitors in use. I use a 144Hz monitor for my centre display, which is FAR clearer, especially in motion than my 2 lateral 60Hz displays.
We could also consider the possibility of creating overlay applications that mask the colours of the ED HUDs (and provide a direction assist for docking with guns stowed, sshhh).
The centre of your eye's sensitive bits is the retina behind the pupil (the fovea). That is bursting with cone cells, and the layout and proportion of red, blue, green cells varies from individual to individual. You can do a rough test on yourself by looking (one eye) at a dot and pull a red pen away from the dot. At some point you'll lose the colour. Repeat in different directions. Now do it with a blue then green pen. You'll have a map of the back of your eye. Try not to freak when you go through the blind spot, the pen will vanish.
Cones need more (this next word is wrong, but makes it easy to see the point) photons to fire than the binary "rods". So they tend to fail in low light. Rods are better in low light, and are across the retina but prevail in the periphery.
So, you see colour and fine detail very well where the lens causes light to focus on the colour cells.
At night those cells are less use, but your rods work. As they are more prevalent in your periphery, you see more there. If you look at the night sky, you'll see more by looking slightly to the side of where you are interested. This comes at a cost, it's not focussed.
Can't comment on the actual question though - the use of orange in the displays. My guess would be any colour would do as long as it's not so bright as to bleach receptors, or cause your pupil to constrict.