Bblinks...Well in my case..I came home from work on day to find my lights not on..I first went to my laptop and opened up the controller and verified it was running..It was...So then I checked all other electrical on my tank and all was fine..I then went to the power supplies..I changed the supply from my slave to my master,And it fired right up...Th problem with these units design is that if the master supply goes out,the slave wont work..Luckily i kept some of my old lighting and was able to use the led on one side and a halide on the other till my power supply got here..
I think you will be happy with the unit,But I would reccomend holding on to your halides for a bit,Just incase..Like I did...Hope this helps..Shane