Bleaching is usually a sign of water issues or too much light. I have been running LED lights on all three of our systems. Like mike stated you really should have used a par meter to set them up correctly. If the lights we're not producing enough par your sps would brown out not bleach. Water tempature is another thing that can also effect sps(temp swings during summer months are hard on sps) I would test your water and if all is well raise your lights up and lower the corals then see if they recover. If they do raise them up a little every week and see how they respond. Good luck