If you have a sizable office with 30 rooms in two or more levels, you will probably have to stick up “turn off” reminders everywhere.
The poor supervisor will probably has to spend 15 minutes checking each room and store rooms for its light status before he knock off from the office.
A simple solution is here now. See all your device status on one panel. You can also turn off any light or appliances without rushing back to the office during the weekend. You could reduce your waste to the minimum.