Office rooms or cubes having a window(s) can switch off their lights in the daytime. Most of the work is done on the lighted computer monitor anyway!
Install motion detector lighting in offices to limit the amount of lights left on. Energy savings= money savings. In the hundreds of thousands of federal offices this would add up quickly.
LET THE LIGHT SHINE IN!
Like most government workers I spend my time behind my desk bathed in fluorescent light. I would propose the possibility of when light bulbs burn out that the replacement ones are a more user friendly color. Fluorescent lights are depressing because they have a cooler color temperature than the sun. Everyone is happier when bathed by the sun and not a fluorescent light!