My friend had a ghost in her apt that is in red clothing but it had a white glow to it.

Well I looked at a chart of different meanings for orb colors (which isn't the same thing, but I think the colors could have similar meanings)and depending on the type of red it is, it says red means stress and dark red means anger, pain, or psychological impairment. White means high frequency, shielding or protecting. So based on that I don't know what it means, but I hope that helps a little :)