Tower lights are vertically stacked light arrays that communicate the status of a piece of equipment or system. Tower light assemblies are complete, ready-to-use light stacks that indicate equipment status. Light modules for modular tower lights connect to compatible tower light modules and allow users to create custom tower lights. Sounder modules for modular tower lights connect to compatible tower light modules and create audible alarm tones in response to specific equipment conditions. Wireless controllers for modular tower lights transmit tower light control signals and allow for wireless remote monitoring of equipment. Mounts, bases, and extenders for modular tower lights provide secure mounting locations for modular tower light systems and components.