Power line carrier controlled lighting system

A large area lighting system interconnected by an AC power line system, comprising:

• at least one means for detecting at least one predetermined parameter in a detection zone of said at least one means for detecting, said means for detecting outputting at least one detect signal in response to said at least one predetermined parameter;
• at least one means for transmitting during a first predetermined time period a power line carrier signal on the AC power line system indicative of said at least one detect signal;
• at least one means for receiving said power line carrier signal on the AC power line system and outputting at least one control signal indicative of the power line carrier signal during a second predetermined time period, said means for receiving having means for providing substantial noise immunity so that said means for receiving reliably recognizes said power line carrier signal;
• said means for providing substantial noise immunity having means for acquiring signal current of the power line carrier signal during a signal integration window and means for identifying a presence of the power line carrier signal from the acquired signal current at an end of the signal integration window;
• an area to be lighted having a floor;
• and
• an elevated lighting grid elevated above the floor of the area and having a plurality of light fixtures, at least one light fixture of said plurality of light fixtures having at least first and second levels of illumination with said second level being greater than said first level and having means for changing between said at least first and second levels of illumination, said means for changing being activated by said at least one control signal.