New lighting technologies are many times more efficient than traditional technologies.
Business lighting upgrades are referred to as a retrofit in many instances. A new lighting system will maximize the use of green technology; aka LED lighting. As well, the electrical system which includes wiring and the control panel may also require an upgrade.
Timers and sensors can reduce light usage to the necessary level; these options use technology to mimic the behavior described above. Sensors come in a variety of models that serve different purposes, and certain types of sensors and light fixtures are more appropriate together than others. For example, lamps that take a long time to start are not suitable for sensors that turn off and on frequently.