OK so step 1 make the wall floor and roof . i indented the ceiling where i want my lights to go and add texture from (Total Textures V07:R2 - "Sci-fi" ) i had got it a few years ago when i was in collage but its dirt cheap now just 22 bucks
now for the light fixture itself. just line it up cut a cylinder in half and make a smaller one for the light. create a v-ray light the add it ass a mesh light to the inner cylinder
now making the gun i got creative and made the bullets left in the gun reading a pop up hologram added lights with texture lighting and used the lattice tool and increased the size of the outer rails pretty cool!!