Indigo-Clean™ Basics

Indigo-Clean™ Basics

What is Indigo-Clean?

Indigo-Clean is a continuous environmental disinfection lighting system that uses safe visible light to disinfect. Unlike UV lights, Indigo-Clean operates in the visible light spectrum at 405nm which is not harmful to patients or surfaces. Clinically proven to reduce surgical site infections by 73%, it kills bacteria such as MRSA and C.diff - and viruses, including SARS-CoV-2, Influenza-A. The system uses two modes of disinfection, automatically switching between modes depending on room occupancy.

White Disinfection Mode

When the room becomes occupied, the system automatically switches to a reduced dose of 30% Indigo-Clean light mixed with white light to provide ambient room lighting as well as continuous environmental disinfection.

Indigo Disinfection Mode 

When the room is unoccupied for a customer-defined period of time up to 30-minutes, the system automatically switches to a full dose 100% of Indigo-Clean light to provide maximum continuous disinfection. Regardless of the state users left the room, all fixtures will change to Indigo Mode making the room appear purple/blue.

Installation with AirFRAME®

A typical Indigo-Clean installation will consist of the following components: Indigo-Clean fixtures (quantity dependant on volume of space in room), one IC100 controller, three Passive Infrared (PIR) sensors, one Ultrasonic Sensor, an optional Override Switch (by others), and 0-10v dimming controls (by others). For smaller room applications such as patient rooms and restrooms, a single IC75 sensor can replace the need for other sensors and dimmers (see below).

Indigo-Clean Fixtures:

The AirFRAME lighting array consists of integrated Indigo-Clean fixtures.

AirFRAME lighting is often supplemented by Indigo-Clean troffers and/or can lights in order to achieve both lighting levels and proper Indigo-Clean disinfection dosing.
The AirFRAME integrated lighting as well as perimeter hard-lid lighting all operate as a single complete Indigo-Clean disinfection system.

IC100 Controller:

The IC100 controller’s function is to switch between White Disinfection Mode (Occupied) and Indigo Disinfection Mode (Unoccupied) via sensor input data.
All ceiling sensors as well as optional override switch are wired to Bays 1-5 on the controller input terminals.
A Building Management System (BMS) can monitor the room occupancy via Interconnect terminals (IC1 / IC2) on the controller.
A control line from the Brown/Yellow terminals on the controller is wired to each fixture and/or driver enclosure.
There are sensor status lights; however, there are no user inputs on the IC100 controller.
In the event the IC100 controller loses power, the system defaults to White Disinfection Mode.

Ceiling Sensors:

There are four Passive Infrared and one Ultrasonic sensor included with the IC100 kit. 
Each sensor has 3 low voltage wires that require a home run back to the IC100 controller.  When the sensor detects occupancy, it sends a signal to the IC100 controller for the duration the sensor is programmed for. If no occupancy is detected by the sensor for the duration of the sensor-programmed length of time, the sensor stops sending its signal to the controller. If no other sensors are sending occupied signals, the IC100 controller will send the signal to the lights to change to Indigo Disinfection Mode. If any sensor detects occupancy, the controller will switch to White Disinfection Mode.
The sensors are what determine the time delay between occupied mode and unoccupied mode. Each sensor is adjustable from 30-seconds to 30-minutes. Sensors are factory set to 30-minutes.

Override Switch (optional, by others):

This optional override switch holds the room in White Disinfection Mode for as long as the switch is engaged. It is often requested as a backup in case sensors fail to detect occupancy.
If used, care should be taken in design and labeling in order to avoid accidental engagement. If a user mistakenly engages the override switch or it is forgotten about after a case, the lights will never switch into Indigo Disinfection Mode.
It is recommended that this switch be located at a high elevation on the wall similar to where an emergency light test button may be located, using a keyed toggle switch, properly labeling, etc. to ensure users in the room do not accidentally engage the override.
The switch can be a simple toggle light switch or any other type that closes the low voltage circuit between terminals RD5 and BU5 on the IC100 controller.

Dimming Controls (White Mode 0-10v dim-to-off):

Indigo-Clean lights require 24/7 120~277VAC for Indigo-Clean modes to function properly. The lights can be turned off via dim-to-off on a 0-10v control line. When the dimming controls send 0V on the dimming circuit, the white lights will turn off. For example, if a simple slide switch (LED 0-10V capable) is installed, sliding the slider all the way down will turn the lights off. All the way up is full bright and everything in between is dimming 100% down to 1% then to off. Care should be taken when selecting lighting controls compatible with dim-to-off and LED 0-10v controls. Control systems should NOT cut power to the lights to turn them off.
For simple on/off control, use a toggle switch to close the 0-10v dim-to-off circuit.

Interconnect (occupancy status monitoring):

The IC100 controller is equipped with interconnect terminals labeled IC1 and IC2 for connection to a BMS. The IC100 controller will output the below voltages on these terminals depending on the state of occupancy:
0 volts = Unoccupied
5 volts = Occupied
Monitoring systems capable of detecting voltage outputs can be connected to these terminals.


A general user of the room should NEVER have the ability to cut AC line voltage (120~277V) to the lighting fixtures. They require 24/7 line voltage for the Indigo-Clean modes to function properly. White light controls are SOLEY via low voltage (0-10V Dim-to-Off) controls.
Never run low voltage control wiring (0-10VDC) in the same conduit as line voltage (120~277VAC).
Each Indigo-Clean fixture and AirFRAME electrical enclosure has 7 connection wires or terminal block points which can be daisy-chained to each fixture/enclosure.

            (3) are for 120/277V house power connection (Line, Neutral, & Ground)
            (2) are for 0-10V dimming which connect to building controls and/or room switches (dim-to-off)
            (2) run back to the IC100 controller to control the Indigo modes

Room Example: 

The Orange lines are dimming control (0-10v) from three dimmers that control White Mode lights for perimeter down-lights, AirFRAME perimeter, and AirFRAME interior lights.
The Purple lines are the IC100 0-10v control lines that tell the lights when to switch into Indigo mode.
The Green lines are the sensor control lines that take sensor inputs to tell the IC100 controller to stay in white mode.
Not shown are the 120/277V power lines that will need to go to each fixture j-box and IC100 Controller. These should be switched providing 24/7 power. 

Smaller Room Applications:

For smaller room applications such as patient room, smaller restrooms, waiting areas, etc., a single IC75 controller can take the place of additional sensors and dimming controls.

IC75 Controller:

The IC75 controller is a sensor/controller combo unit available in either a ceiling mounted or a wall mounted version. The intent of this unit is to control dual-mode Indigo-Clean lights in smaller spaces where multiple sensors are not needed.

A single IC75 controller controls all Indigo-Clean lights within a single room taking the place of the IC100 controller and all separate ceiling sensors.

Dimming controls as discussed above can be used but are not a requirement.

RCP Drawing Terminology:

      IC - Indigo-Clean

Squares, rectangles, and/or circles labeled as 'IC' on SLD drawings reference required hard-lid lighting based on Indigo-Clean dosing requirements. Although hard-lid lighting may be required, indicated fixtures may be interchangeable based on room dosing. See dosing equivalents below.   

     PIR - Passive Infrared Sensor

Ceiling mounted sensor meant to sense movement in range. Similar to home alarm system motion sensors, PIR sensors are based on Passive Infrared technology which detects explicit movements.

     US - Ultrasonic Sensor

Ceiling mounted sensor meant to sense small, finite movements ultrasonically. This sensor is meant to detect occupancy in cases where movement in the room is minimal. Ideally this sensor is placed as close as ceiling space allows to the surgical area. This sensor is ultrasonic and may need to be adjusted after air balance. 

Dosing Equivalents:

SLD drawings will show the minimum required lighting to achieve proper Indigo-Clean dosing. More lighting can be added upon request; however, lighting cannot be removed below minimum dosing requirements. The size of the lighting fixtures can be adjusted based on the following criteria.
      One 1'x4' Troffer = One 2'x2' Troffer or Four Ø6" Cans
      One 2'x2' Troffer = One 1'x4' Troffer or Four Ø6" Cans
      One 2'x4' Troffer = Two 2'x2' Troffers or Two 1'x4' Troffers or Eight Ø6" Cans

    • Related Articles

    • Indigo-Clean™ Testing and Troubleshooting

      White vs Indigo modes Post Installation Testing: The light modes are visible to the human eye. There are essentially two modes of light. White Disinfection (occupied) and Full Indigo (unoccupied). Indigo mode is full intensity of the Indigo diodes ...