Help with Vray Lighting

[danielbull]

I've created the scene from the image (see image) and need some help to get the lighting right.

From the looks of it, all the lighting is coming from self illuminated objects. I attempted this with the Vray LightMTL. i used a gradient blue light map for the bays and a white material for the ones at the top. But they just make everything too bright. Even if I hide the bays and just have the top lights, it looks like normal room lighting. I want it kinda dark like the picture. If i lower value next to colour it just makes them dull.

 

Can anybody help?