Hello guys. I am doing the wiring for the lighting on my layout and I have already blown 2 bulbs instantly on 2 Lionel street lamps. Can someone put me straight. These are supposed to be powered by lockons. I decided to power them separately using a Tech II power pack that provides 18 fixed volts. Is that too much for lights in building, yard and street lights etc? I note that the lights will come on using the variable DC side of the power pack too. How best to light up my layout?