Outdoor Lighting | My Business | Mississippi Power | A Southern Company
  • Katrina 2005-2015
  • Katrina 2005-2015
  • Outdoor Lighting

    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.

    Replace mercury lamps

    Get rid of all mercury lamps inside or outside the building! Replace with high-pressure sodium (HPS) or metal halide lamps. These lamps have a higher efficacy (efficiency) than mercury lamps. A 400-watt mercury lamp is rated at about 47 lumens/watt, whereas the same size metal halide lamp is rated at 64 lumens/watt and a similar HPS lamp is rated at 112 lumens/watt. Also, mercury lamps have extremely long lives, but light output reduces drastically as lamps get older. A dim mercury lamp costs as much in energy as a brand new one to operate.

    The lowest cost lighting isn't usually the lowest purchase price

    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 run. 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, and if you can tap into utility rebates and other incentives.

    Use life-cycle costs to make decisions

    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. That is why fluorescent lamps are usually much less expensive over the life of the lamp than incandescent.