Hey Gavin dont these signs throw out some light. A good friend of mine made me a neon sign for the front of my business with my logo SPURR ELECTRONICS.
We mounted it on the front of the shop facing the main road. When we turned it on for the first time at night holly SHIT it lite the whole street up in blue and red "unreal".   2 weeks later I get a nasty letter from the council saying that the houses across the street were complaining that they couldnt sleep due to a flying saucer being parked across the street at night! DO SOMETHING ABOUT IT    So I visited the guys across the street and fixed it all up by using a timer off at 10pm. 
So yes big dog this will light up you shed!