...which is why I always tell people to go by the horn and don't worry about who is opposite a clock since it is rare you can see both at the same time anyway. At least with the backboard lights, there is a good chance an alert official could line up the shooter and the backboard to some degree. However, the bigger reason for the LED lights may be video review...the board is almost always visible in at least one angle for last second shots, clocks are much less frequently in the same frame.