I am installing street lighting and building lights in my HO layout. I am using grain of wheat bulbs for most of it. They are connected in 6 zones of approximately the same size. There are going to be 50 - 60 bulbs total. What is the best way to power all of these? I had planned to use an transformer from a old train set but IT is shot. The wall worts I have are all for cell phones. Just need to know what to get. I want all six zones to have the same power source, divided by switches.