Lighting of scene

I have lit the scene only by the 5 lights you see here due to the fact that i wanted the scene to appear quite dark and vacant. No issues with the lighting cropped up.

On another note when i was trying to put the people into the scene so as to cast the shadows, something has gone terribly wrong and i can no longer render the scene using the default maya render. I have tried rendering it with Mentalray but that turnt up dissapointing as the lights didn't want to work the way i wanted then to while rendering with mentalray.