Tower Lights

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Tower Lights

 Tower Lights/Beacons/Signaling Solutions

Stack lights (also known as: indicator lights, And On lights, warning lights, industrial signal lights, tower lights and light towers) are commonly used on equipment in industrial manufacturing and process control environments to provide visual and audible indicators of a machine state or process event to machine operators, technicians, production managers and factory personnel.


Stack lights are used in a variety of machines and process environments; specific colour-coding is assigned by the system designer. Commonly used colour codes for machine state conditions include:

  • RED: Failure conditions such as an emergency stop or machine fault
  • YELLOW: Warnings such as over-temperature or over-pressure conditions
  • GREEN: Normal machine or process operation
  • BLUE: External help request, where an operator might be requesting raw materials, scheduling or maintenance personnel assistance
  • WHITE: User-defined conditions specific to a machine, often related to productivity monitoring
  • Optionally an audible alarm buzzer, typically in the range of 70–105dB, may be added to alert machine operators to high priority conditions.



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