Whoever decided that turning off the lights during pregame is impossible can eff off in my book.
Not impossible, but impractical. The current lights don't have shutters on them to block the light, to go dark they must be actually turned off. Then its takes 20-30 minutes to warm up and get bright enough to meet minimum game lighting. Not practical when starting lineups are done right before tipoff.
Adding shutters to the lights is relatively expensive, but is on the list of possible improvements to Bramlage (list includes videoboard, concourse, and yes, hanging banners)