I keep asking lighting questions, but I'm just not getting it. Maybe someone can answer some pretty basic questions.... I'm using miniature bulbs that light at 1.5v (using a battery). They also work at 3v, but are very bright. I'm sticking with the 1.5 because it looks better and hopefully will extend the life of the bulbs. What I'm trying to figure out is how exactly this works when there are multiple lights in a structure, and obviously multiple structures on a layout. Here's what I mean... I have one structure now that I'd like to put 4 of these lights in. I would imagine that would add up to 6v. Let's say I add 2 more structures -- one totally 4.5v and another totaling 7.5v. I'm assuming I would wire them all together for a total of 18v. Working with this model, I'd have to increase the power any time I added more lights. Potentially, I could end up with some weird number, like 41v or something. Is that right? Doesn't sound right. Or is there some other way to wire this so that each structure only needs a total of 1.5v since the highest voltage for a single light is only 1.5v. If this latter option is right, and each structure stays at 1.5v, then what about when I combine the multiple structure? Does it still stay 1.5 or does that become 1.5 + 1.5 + 1.5, etc? Whichever option is right...can you tell me if that's parallel or serial wiring so I can look up even more info? Just trying to do this right the first time and plan ahead.