For the past umteen years I have been using old computer transformers stripped from computers and for the price of $10-$20 used they provide constant DC voltage of 3V, 5V, and 12V and that in conjunction with resistor (if needed) could power anything on your layout. There are many instructions on the Internet on jumping the wires to make them run without a computer. Basically just the right 2 wires soldered together and then when you switch on the AC voltage your power is on and converted to a pure DC voltage which in my opinion is much better than AC. I have used it to power miniature Xmas tree bulbs in building as well as quite a few LED lights. Most of these transformers are rated 600 watts or better. I have powered about 100+ buildings and street lights using 2 transformers and never had to replace a street light bulb or any bulbs for that matter. When adding light to buildings the intensity of individual lights weather it be incandescent or LED can be varied by adding small resistors to each bulb so all the lights in a building don't have to be the same brightness.
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