Arenas and concerts typically use halogen lamps, and sometimes now LED. The light produced by a halogen can be easily dimmed compared to other bulbs. Metal halides, once off, must cool before they can be re-lit. Did you ever turn the lights off in your gym in high school? You can't just turn them back on instantly. The temperature must be reduced for the arc to strike. Coincidentally, it's this temperature build-up that causes the metal halides to burn brighter.
In short, the lights in the Hump and at Davis Wade are different.