Okay I get it now.
Just one thing, which is an issue on the part of the game makers then. Darkvision allows sight in darkness, even total darkness. The Drow exist in, for the most part - excluding any patches of glowing fungi - total inky, no light, nadda zip ziltch, total darkness. Any light source, except a faint candle, causes them light blindness. Thus they don't use any light to voyage around the Underdark. So, by that alone, even the Ebon Eyes spell should allow sight in total darkness if the creature possess Darkvision.
Since wording is so important, I think a GM ruling is needed here. Sorry to be a pain, but I don't want anything I plan on using, becoming an issue half-way in the game. I think its better to hash it out now, than later.