Turn out lights when not needed
A Saskatoon school saved 43% of their lighting energy by turning off unnecessary lights. This would result in GHG emission reduction of 42 Tonnes CO2/year. In the attached graph, January and February are before the behavior change, March is when unnecessary lights are off.
Start by encouraging people to turn lights off when they leave the room.
Can you rearrange your workspace to make better use of natural light? Would a small task light make your workspace more comfortable than the overhead lights?
Use signage at light switches, notes in newsletters, reminders at staff meetings, etc. to ensure everyone knows which lights are to be left on and which should be turned off.