Did you set a colour for the emmisive quality? If it is black, you will not emit any light. Also, try not to put the value too high, I use the following qualities in general, as they give a good apearance of light atenuation for things like the inside of cockpits;
Emmisive 0.3 to 0.5,
And don't forget to set the color to a very pale grey, blue or green (or whatever, just so long as it is reasonably pale) by first clicking on the color bar to the right of the emmisive value, then clicking the color you want on the color cube. Use the vertical color shade tune bar to the right of the colour cube to set the exact shade you want. It should work.
Just a thought, if it does't work; Are you making sure the normals (faces) of your model are properly flipped? To see them in Orbiter, make sure you check the following on your anim8or model;
In the tool bar at the left, click the object/point editing mode button, and then click on the face select button. Then click on one of the faces of your model. It should select in yellow on the outer facing faces. If it comes up blue, it will be invisible in orbiter, and you will not see any of its attributes. If this happens, go to the edit menu, down to flip normals and release. It will switch to yellow and will be visible in Orbiter.
Hope it helps....