Many commercial building energy codes have energy savings rules for outdoor lighting. For example, ASHRAE/IES 90.1 2010, the IECC energy-efficient code, and some model ordinances call for outdoor HID ballasts to have some type of bi-level light output and/or dimming capabilities. Additionally, California Title 20 product regulations require 150W to 500W MH fixtures to have a specific level of ballast or fixture efficiency or to have automatic energy-saving lighting controls.

For these reasons, bi-level control systems for area or street lighting are finding increasing application. Housed in the top surface of a luminaire, a node can communicate via radio, satellite, and/or cellular system to a central operating center, delivering control and status messages to a web page. This allows an operator to control, adjust, monitor, and receive maintenance messages from each luminaire on the system.