I am mulling over options of upgrading my little barn. Stalls are quite dark with no windows in the horse barn section. If I am to go by my friend's suggestion, he says adding turn out stalls makes sense with doors than wasting money on window. He goes on to add that doors are helpful in times of emergencies or fire. I still prefer windows. What would be your recommendation if  I can either out in three 3x4 windows, or out in wall lights (a 2' strip of clear corrugated paneling) along the top of the wall down each side? I browsed for window review sites like http://www.ontariowindowreviews.com/window-companies/ . It shows a list of window sites, will they satisfy my barn requirements. I also would like recommendations on reasonable inexpensive flooring option.