Maybe using LED's ?
Ain't a "Dollhouse guy", but I lit a HUGE number of houses and stores back in my model RR days...
LEDs will give you plenty of light, but don't forget that you'll need to tie in 1/2-watt resistor... They WILL burn out if they too much current... But they last practically forever, otherwise... Grain-of-Wheat and the even smaller Grain-of-Rice bulbs will give a softer, yellower, more "room lamp" lighting effect though... Trouble with those though is that they A; burn out eventually, and 2: are hard to replace unless you really plan ahead with the fixtures...
While the LEDs are easier to maintain and last longer, I still prefer the softer light of GoW and GoR bulbs for room-lighting....
Don't over-look the mini-lamps on Christmas lights either... They're a fast source of cheap lighting... They can be mounted with their sockets, or pulled out and soldered right to the wire.. They also work well for fiber-optic light-sources..