We have a 300W transformer with 12gauge wiring. We have 12 20w lamps. At first it didn't work at all until we split some of the lights to the low voltage outlet on the transformer and the rest on the high voltage outlet. It was working great for a few weeks and now it seems we are having alot of lights burn out on the high voltage outlet side (which has more lamps than the low voltage run). Can't decide if the lamps that came with the kit were poor quality or if it is a high voltage issue. Any suggestions?