I took a par video of the reeftech lights outside the tank.The unit was placed 26 inches above the floor and I had a pad that was 24 inches x 24 inches.It hard to take a video when you are trying to take par readings.My readings are mostly at the floor level because it was impossible to hold the camera and tape measure at the same time while also trying to measure par.I will also try to take measurements in the tank but I will get my wife to help me with that
http://www.youtube.com/watch?v=ryp9WMEJeuY