If "Arctic Blue" is a straight equal unresistored mix of blue and green then it is true cyan which is blue.
http://en.wikipedia.org/wiki/CyanNote especially the "electric cyan vs process cyan" section and the right side panes with ADDITIVE secondary cyan vs SUBTRACTIVE primary cyan. Notice that the additive secondary cyan pane has RGB values of 0 red, 255 green, 255 blue. This represents a fully powered equal mix of green and blue in RGB and should [in theory] be what an unresistored RGB LED mix produces since RGB mixing is ADDITIVE not subtractive like coloured filters on a white LED are.
If your monitor is calibrated correctly methinks Arctic Blue
should be close to what ADDITIVE SECONDARY CYAN shows there.
Of course reality isnt theory and human colour PERCEPTION varies individually ['colour blindness'] and also I've noticed that for me at least because high powered LED sabers are very bright direct EMITTED COLOUR light rather than how we perceive most object's colour indirectly from reflected light that
for me sabers do
seem a
bit 'paler' in hue than the same colour on a PC monitor...I hypothesize this may be because they are higher powered tighly focused light sources [?] or maybe its just my own perception so your milage may vary.
So personally I would expect an Arctic Blue to appear a bright pale cyan blue and look forward to getting one and finding out.