This lighted wall lamp will look great on your buildings! The large size is perfect for entryways in HO or O. The smaller is nice for side doors. This lamp comes with a nice warm white light, with 14 inches of kynar wire. You can run the wire inside of your building, then meet up with the resistor if needed.
For 3 volt uses you are all ready to go, just add your 3 volt battery or power supply.
For 7-19 volt AC/DC/DCC we have a bridge rectifier/resistor harness you can attach to the light before you connect it to power.
Comparisons: A dime is 17.5mm, a AA battery width is 14.1mm and a Sharpie marker width is 11mm