In our school auditorium we use a Lehigh, Legacy Dimming System. I don't know any of the specs from the dimmer rack, besides the fact that it is made by Lehigh.It all starts when we try to turn off one of the ellipsoidals. But it does not want to turn off, in fact it doesn't do anything. So we call it the "Phantom Light" because it is on even after we leave for the night. The only way it turns off is to let the dimmer cool down. (or of course hit the main breaker) Then soon after that some of our border lights started to freeze. I checked out which dimmer it was on, and it happens to be that the border lights, and the phantom light are on the same "cluster" of dimmers. So we switched one of the clusters from the house lights, with the cluster that was giving us problems, and we haven't had a problem since. But what is it about the dimmers that made them freeze?