Yes, like having the new auxiliary floodlights on for the game v Swansea
A bright day, the "old" lights also on.
Might be lower energy consumption, but still some consumption and not needed for that game.
Maybe they have to think if they are needed towards end of the game so have to turn them on before kick off, don't think they could turn them on part way through the 2nd half when it starts to get darker. Could they turn them on at half time?