Hmmm... What sort of setup can you have going on there? Will it be any type of little greenhouse tent? or Just container plants sitting on the deck area? Also, not sure what sort of season you're in right now but will the sun be shining directly over your terrace earlier or later as time goes on in the near future? Sunlight is essential, even if its filtered or reflected, however too much direct sunlight in certain regions or times of a season can be harmful if not controlled properly. But by the sounds of it you don't have any filtered light, and its all just complete shade til 3?...

idk, if you can answer my questions, I guarantee I can recommend an excellent and simple suggestion for you. Deal?