Sure ya can. Easiest way is with a 12v DC to 24v DC transformer, like these:
12/24 volt DC/DC converters 700 Watts peak
You're probably going to need a higher amperage unit, I imagine those lights are quite the draw.
I'm not endorsing them, that's just the type product you want.
May also need to consider the increased draw (in Amps) on your electric system, it may also require a stepped up alternator to keep the juice flowin'.