well, I did, right now I'm running the 100w each bulbs.... so far no problems, it will draw 15.3 amps instead of 8.5 amps at 13V ..
Amps = watts/voltage, so calculate with whatever V you want
I think they normally come with a 15amp fuse? not sure, i've allready used larger wiring and a bigger fuse, but can't guarantee any situation
go here
http://www.powerstream.com/Wire_Size.htm for wire size and load guide... I always factor in a little extra for safety and additions