I like six volt stuff. The only thing I own that's 12v, is my Chinese Army motorcycle.
The only time I notice that my lights aren't as bright as a modern car, is when some body with those super white or blue lights is behind, or worse, coming towards me. That's what the big 6v fog lights are for! I' going to save up, and get dome of those '39 Chev ones for my panel, the big amber ones with the sweet lenses.