Locke,I suggest make a box,make a 256x256 Red textr call it Box_t.bmp,Txtr as a box,Plane or Face.Make sure that "Has Light Map" is checked, NOT "Has Night Map"..Compile to what ever existing mdl you want(but make backup of that mdl first).Compress the 24bit with DXT to DXT3,or 32 888.Then save as Box_t.bmp and then recompress as DXT3 or 32 888 and save as Box_L.bmp,the Red Textr should showup at nite.Then you can move to your project.The txtrs must have the same name and have _t.bmp on the main txtr, before the_L.bmp lite txtr can work.Also the lighter the txtr the briter the txtr.A white box in the _L.bmp will be a briter txtr than the Red box. Hope this helps.
aceronzo