I built a level in MED and want to keep it as a .mdl file but how do I add lighting with no level geometry?

Windows 7/ 2.8Ghz Quad Core i7/8 Gigs DDR2ram/ 2 Crossfired ATI 6850's and one crazy Level Designer! On the "Scion" dev team!!

My old Work http://s44.photobucket.com/albums/f34/penut117/