Build your own conservation program
There are three ways in which lighting energy use can be reduced by building owners: implement a greater degree of control over the use of lighting, use more efficient lighting equipment and apply better lighting system design strategies. Translated into a general guide, the goals statement for a comprehensive lighting energy conservation program should read: turn it off when it isn't needed; use the most efficient, suitable equipment; and provide light only where it is needed.
Consider the cost of energy when retrofitting lighting systems
When considering lighting system retrofits, remember that the least expensive part of the system on a life-cycle basis is the fixture and lamp. The most expensive component is the energy that the system uses.
Don't think about first cost only!
Don't let first cost deter you from investigating some of the more energy-efficient lighting technologies. The most expensive lighting equipment usually consumes the least energy and therefore costs much less to operate. The initial cost of a state-of-the-art system may even be lower than the overall cost of a less expensive and less efficient system if you use fewer fixtures to achieve the same or better light levels, especially if there are utility rebates and other incentives.
Replace inside and outside mercury lamps
Get rid of mercury lamps inside and outside a building. Their light output reduces over time, and a dim mercury lamp uses as much energy as a brand new one. Replace them with high-pressure sodium or metal halide lamps.