I think there are totally 16 CCFLs distributed horizontally & evenly at the back of the LCD. I don't know exactly how long they are, but they are at least as long as the width of the screen, so the illumination could be even. I've been wondering why there is so little information about the aluminum displays (A1081, A1082, A1083). I'm pretty sure there are still many being used, and some may need attendance. Maybe ifixit.com could show some instructions on this.