Not a stupid question. Most of the outdoor flood lights sold at Home Depot, etcetera, such as the Malibu are low-volt systems, presumably for safety reasons. The 20W 12-volt MR-16 lamps can be connected directly to a sealed lead acid battery through a switch (and fuse, of course).

I looked at the outdoor flood light option back in November when I started work on my own light system. I went to Home Depot, took one out of the box and looked them over.

Black cast metal

The Canterbury Copper fixture looked nicer, but was much more expensive and heavier.

It is just a light fixture with wires coming out and isn't voltage specific. In the end, I decided the outdoor flood light housings were a little bit too heavy and clunky for me and chose to use the Optronics driving lights from JCWhitney instead. Even as we speak, I am working on the light system.