I've done some research on this and some say to run it with the length of the room. Most say to run it parallel to the light coming in the room. I'm not too sure which way is parallel to the light. I have a room that is 45' x 14'. The windows large picture windows and are along the 45' wall. Do I run it with the long ways of the room so the first row is 45' long? Or should I run it perpendicular to the windows so the first row is 14' long? Thanks!