Flashbulbs, the way to go! =]
I got the T32 flash, its a nice compact one, the smallest I can think of as well that packs that much light, even has a rotate-able front for angled bounce flash. GN of 32 meters or 100ft @iso 100. Lacks a bit in manual modes though.
What is your intended goal? Using for fill light in architecture at night? If using long exposures, I have read sometimes a good choice can be a high intensity flash light or flood light to paint in the areas.