Further still to my previous two posts..... (I have this thing about red it seems
)
A little research on the web shows the red phosphors of CRT's and LED/LCD monitors to have a wavelength of about 620nm: a fair way short of the 652nm of H-Alpha.
Hence even if you make a H-alpha image as deep a red as the display allows, it isn't quite deep enough.
Making the image an orange, salmon, tuna or whatever fruit/fish colour you like
simply takes you up the spectrum: in short, going the wrong way.
I suppose the best analogy I can give is: viewing CRT/LCD images is a bit like listening to a melody being played with the middle two octaves of a piano. The melody is generally recognizable, but we really need all 88 keys to fully appreciate it.