If the batteries are somewhat down from new condition a KPR102 can last a while. The 2D I got for Christmas (They didn't know any better!) got three Cs from my used stash and is pretty bright and didn't blow up yet.
If you can find a M*9L!te M*9num St@r Xenon bulb for 3 cells it will make a TIGHT bright hot spot, and will do a barely decent job (not TOO good) of flooding. Ditto for 2Ds with a 2Cell MSX.