Method of controlling serially-connected lighting devices

A method comprising:

• generating a bus voltage on a power bus, wherein the power bus is coupled between a fixture controller and one or more lighting devices;
• sending a query message to the one or more lighting devices that requests the lighting device to send a status message including a minimum measured value of the bus voltage on the power bus, a maximum measured value of the bus voltage on the power bus, or an average measured value of the bus voltage on the power bus over a period of time;
• detecting a brownout event on the power bus;
• and
• sending a power message to the one or more lighting devices instructing the one or more lighting devices to decrease their respective high-end intensity level in response to the detection of the brownout event on the power bus.

At least one non-transitory computer-readable storage medium comprising executable instructions configured to cause at least one control circuit to:

• generate a bus voltage on a power bus, wherein the power bus is coupled between a fixture controller and one or more lighting devices;
• send a query message to the one or more lighting devices that requests the lighting device to send a status message including a minimum measured value of the bus voltage on the power bus, a maximum measured value of the bus voltage on the power bus, or an average measured value of the bus voltage on the power bus over a period of time;
• detect a brownout event on the power bus;
• and
• send a power message to the one or more lighting devices instructing the one or more lighting devices to decrease their respective high-end intensity level in response to the detection of the brownout event on the power bus.