I don't want to blow your bulbs here so i'll give you a possible answer: Parrellel because then both lights are given the same amount of voltage, but series will divide the volated=between leads
http://en.wikipedia.org/wiki/Series_...allel_circuits
http://physics.ucsc.edu/lecturedemon...s/e_m/i_v.html
Both good websites to check out, the second one is a simple example of electricity flow between the two dif types of circuits, currently I forget which is best for this application, sorry.