I've never seen a capacitor of that value with a 330 volt or greater rating. I suspect it would be the size of a dustbin. Low ESR capacitors are preferred for xenon tube driving too. 330volts is the 'standard' flash-tube potential for speedlights. Though some may run a bit higher. Old Metz units for example. I think you could fire a small xenon tube with a terminal voltage of 200volts or maybe less. No idea what the efficiency or colour spectrum would be like though. Small studio monolights in the UK tend to simply rectify the mains 230 v ac (RMS) to give a roughly 320 volt DC supply to the storage capacitor. But there's no real world standard for high energy studio strobes.