In existing buildings where more than sufficient lighting exists, rotate half of the bulbs in each overhead fixture by 45 degrees to deactivate them. That could save up to 50% of electricity used for overhead lighting with no upfront retrofit investment. Many areas I work in are far too brightly lit. The excess lighting is often visually uncomfortable and a gross waste of energy.
I suggest that you have GSA mandate that office buildings move to motion sensors for all lighting to save electricity which will in turn save millions and it is green as well.
Reduce the amount of lighting in Federal buildings during the summer months. Dropping to 50% lighting during late spring thru early autumn will cut the electricity bills substantially and reduce the frequency/costs of replacing light bulbs and light fixtures. The more intense daylight streaming in from windows and glass doors should at least partially compensate for the decrease in interior lighting.
Even better than an efficient electric light is making best use of real daylight. Clerestory windows, glass brick, and Solatubes are just some of the ways we can bring light inside without electricity.
Install daylight corrected lighting in common area such as break rooms and meeting rooms, to help employees' health, morale, mood, and productivity.
The USPTO buildings (completed in 2004) were designed so that most of the interior space receives no natural lighting. This includes half of the offices, most of the conference rooms, and most of the break rooms.
Installing windows in the top 1/3 of the interior office walls would allow for privacy while providing natural light from the window offices.
We have thousands of government buildings, and millions of fluorescent lamps. In my building we have the double bulb lamps. If you loosen one the other will still provide adequate lighting. This provides a ready spare on hand. You do this to all of our buildings and cut your lighting savings by half. Additionally you will have less UV exposure indoors.
Install Motion sensors for lights in spaces like shops, fan rooms and passage ways that are not manned 24 hours a day. This will save money on inport electricity costs.