not surprisingly theres a shitload of analysis on 'over-illumination' and after skimming thru it Im even more confused why they leave ALL the lights on. This report (it was from 1992 tho) said that lowering lighting levels by 25% can result in savings of 80%
I remember interviewing for a company that specializes in making buildings more efficent with everything from the lighting to the toilets so hopefully the trend catches on