No More Infravision!

I think in my next B/X campaign (or possibly later on in the campaign that I'm running) I'm going to replace the infravision that is explained in the core rulebooks with Twilightvision and Darkvision.

Twilight vision would be the ability of elves and possibly other faery types to see in the moonlight/starlight as if it were daylight.

Darkvision would be the ability to see for a short range in near perfect darkness conditions. The range of vision would be 60-90ft in most situations. Nobody knows how this works, perhaps characters with darkvision can see some other exotic radiation source that is present in the underdark? Or maybe it's just magic?