Mounting outdoor lights

[Mdaddyrabbit]

In the picture I have attached this is one of the end walls. I want to mount a light in the center of the wall but there is not a wall stud to mount a electrical box to. How do you think would be the best method to mount a light on the other side the wall facing out to the yard since there is only the outside sheeting to mount to?

Thanks

 

[dw1]

You could run a piece of unistrut horizontally across the verticle studs, mount a metal box to the strut, have it flush with the outside of your metal