Interesting however there is data going back to the 1920's about changing lighting at work (Taylor I think) that shows that the very fact of changing light levels improved output.
However when the changed the lighting levels back output improved again. It looks to me this is based on poorly designed studies, the including of trigger words like "kids" "iPad" is a bit of a red flag.
There are a whole bunch of effects that you tend to get when conditions change. Same thing happens in traffic where (say) a set of traffic lights goes out, and suddenly there are fewer accidents. Of course, this is because the lights being out puts everyone on their best behaviour and the accident rate goes back up as people get used to it.
However when the changed the lighting levels back output improved again. It looks to me this is based on poorly designed studies, the including of trigger words like "kids" "iPad" is a bit of a red flag.