Tesla was performing at the California State Fair last Friday night. There was an area cordoned off behind the stage where the roadies and other concert crew were hanging out before the show. There were dressing trailers and picnic tables set up, that kind of thing.
For some reason, this area had several blue floodlights lighting it. Why blue? Are roadies sensitive to fuller spectrum light?
This area was in the space between a pair of two-story buildings and a big ramp leading to the second floor. So, although it was sectioned off, the public could still look down on the roadies from the suspended walkway. Perhaps the blue lights were to keep things dark enough to frustrate photographers and gawkers?