indoor lighting large scene
 

I need help getting even lighting in my underground subway before I start texturing my scene. I still have a few more pieces to put on the wall but I am almost done modeling and I am trying to get the lighting done before I texture everything. I have used spotlights to light the scene as is, but there is not even lighting and shadowing like I want. What is the best light to get even lighting for a large scene. I tried a few other lights like the ambient but I am getting to much shadow. Here is a jpg of my scene.

try an area light. they're scalable (and from what i recall in most cases they increase in intensity overall when you do) and they can provide you with some nice blurred raytraced shadows.