I think some lamps used for cinematography are a type of arc lamp (Xenon long-arc-lamps), and range to around 100kW apparently! Curious about the safety of those as you mention ozone + UV (I guess if it's sealed you don't get ozone?).
Inert gas in there. But some old search light WW2 style lamps were open arc. (The classic Batman light) were open arc and a huge rod. Read a story about adjusting the distance between rods because the carbon would slowly get eaten.
Even with a modern short-arc lamp and an electronic ballast, you can get a little whiff of ozone when the lamp starts, I'm not sure what the mechanism is.
e.g. - http://www.luminyscorp.com/index.php/100k-linear-2/