Thank you guys for all suggestions, really appreciated. However I was hoping to get some answer about lighting and how that affects visual insight. Its well known that if you put a large candle or have a table lamp in front of the window, gives the effect that the amount of light inside the building sipping out will be less. And so making it little more difficult to see in from the outside. This is on night time when its dark outside and light inside. I wish some one with knowhow within visual effects could suggest best placement/angles of lamps in order to maximize this effect.
Thank you for all your help.
Best regards
John
Edit: The statement that the amount of light sipping out is less because a candle is infront of the window sounds stupid when I think about it and is of course not scientific established in any way, however it creates some kind of effect.