For really small set-ups, I use a home made snoot on a photoflood. This gives the appearance of a hard edge spot, and makes for some dramatic single source lighting effects.
I work as a dp for film and digital cinema, this has always been the preferred method to get this effect for miniatures. just make sure there's enough air circulation as I have had some bulbs burst it is not fun. fog machines help but if overdone it'll look like its underwater.
"The real work was thinking, just thinking." - Charles Chaplin