Echo Light Sensor

The Echo Light Sensor (also known as a Photo Sensor) provides light level measurement and lighting control for the connected Echo control system. The sensor measures lighting conditions to maintain a programmed lighting output in both dimmed and switched systems. Light Sensors are available in either black or white finish:

Echo Light Sensor
E-LS Light Sensor head with controller
E-LSC

Light Sensor controller Only

E-LSH Light Sensor head Only

Each Light Sensor controller supports one or two Light Sensor heads. A Light Sensor head may be installed within the controller or installed remotely, using up to 1,000 feet (304m) of 16 AWG (1.3mm2) wire per controller. When using a pair of Light Sensor heads, both sensor heads transmit their light readings to a single Light Sensor controller. The controller averages the levels and uses them to control lighting within the space.

Reference the Unison Echo Light Sensor Installation Guide for more information on installing this sensor. All ETC documentation is available for free download from www.etcconnect.com

Configuring the Light Sensor

Note: Changes made to the Echo Light Sensor configuration settings using the EchoAccess Mobile App impact the behavior the sensor when Custom Config mode has been enabled (set to On). The Custom Config mode DIP switch is located on the circuit board (rear side), of the sensor . A sensor placed in Basic Config mode (Custom Config DIP switch set to Off) is unaffected by EchoAccess Mobile App custom configuration settings.

Note: If off is played from a station the light sensor events will not turn lights on.

Set all values as desired using the keypad.

ClosedLight Settings
  • Current Measurement (read only) - displays the Current Measurement (lux), Lower Threshold and Upper Threshold (lux) of light of the sensor. The Lower and Upper Threshold values displayed are based off of the Photo Deadband offset.
  • [Record Target] - tap to use the current lux measurement as the target lux level
  • Target Lux Value - the current recorded target lux value which can be manually adjusted (tap the value to manually adjust
ClosedSensitivity
  • Photo Timeout - set the length of time the Light Sensor waits before triggering the next action. Any manual lighting control in the space will reset this time. Options include 5 minutes, 15 minutes, 30 minutes, and 60 minutes.
  • Photo Deadband - this setting determines how far off the Target Lux Value the current lux measurement must be (in % of the Target Value) for the sensor to take action.
    • With the Target Lux Value as the center point, threshold values can be calculated by adding or subtracting the Deadband % Target.
      • Low=Target - (Target x Deadband%) / 100
      • High=Target + (Target x Deadband%) / 100

Action Type

Set the Light Sensor Action to function in either Switch or Dim mode, and configure their related actions.

ClosedConfigure Switch Mode

In Switch mode, the sensor provides for configuration of Switched Bright and Switched Dark Events, each with configurable actions.

  • When measured light exceeds the Bright threshold (Target Lux Value plus Photo Deadband %), the Switched Bright Event Action occurs.
    • Switched Bright Event- use the drop down menus and keypad to set the event action, the preset associated with that action, and the timing of the preset fade.
  • When the measured light is below the Dark threshold (Target Lux Value minus Photo Deadband %), the Switched Dark Event Action occurs.
    • Switched Dark Event - use the drop down menus and keypad to set the event action, the preset associated with that action, and the timing of the preset fade.
ClosedConfigure Dim Mode

In Dim mode, used for daylight harvesting installations, the sensor provides a Dimming Event that can be configured for either Space Raise / Lower or Zone Raise / Lower. When the measured light is found to be outside the set Photo Deadband %, the setting allowed outside of the Target Lux Value, the sensor will continuously trigger Dimming Raise Events and Dimming Lower Events until the target amount of light is reached or artificial lighting reaches its possibly maximum.

Note: Raise / Lower Event actions provide a "Change per second (%)" setting that is the amount of control applied per second while lux measurements are outside the Photo Deadband threshold. 1% is the default setting , meaning the lighting will change in 1% increments. Higher values equal a faster artificial lighting change.

Additional options display for configuration depending on the type of Action selected, either Space Raise / Lower, Single Zone Raise / Lower or Dual Zone Raise / Lower.

ClosedSpace Raise / Lower

Setting the Dimming Event to Space Raise / Lower maintains the entire Space at the set Target Lux Value +/- the Photo Deadband using the set Change per second (%) rateRaise / Lower Event actions provide a "Change per second (%)" setting that is the amount of control applied per second while lux measurements are outside the Photo Deadband threshold. 1% is the default setting , meaning the lighting will change in 1% increments. Higher values equal a faster artificial lighting change..

ClosedZone Raise / Lower

Setting the Dimming Event Action to Zone / Raise Lower provides additional settings to determine if the zone type is a single or dual controlled zone.

ClosedSingle Zone Raise / Lower

Selecting Single Zone Type provides options to set the Zone Number and the Change per second (%) rate.

ClosedDual Zone Raise / Lower

Setting the Zone Type to Dual allows the Echo Light Sensor to control two zones, a primary and a secondary, at different levels when issuing Dimming Event Raise / Lower commands. The sensor should be placed in the Primary zone.

The Primary Zone is the master, providing the Secondary Zone with Raise / Lower commands using a user configured Daylight Exposure offset.

Daylight Exposure (%)Daylight Exposure (%) is the percent contribution of ambient daylight to the zone. is set to 100% for the Primary Zone Number and cannot be changed. The Primary Zone Number has the highest possible capacity for ambient daylight exposure and this is the location where the Echo Light Sensor will be sampling light. The Secondary Zone Number Daylight Exposure (%) setting is user configurable.

  1. Set the Primary Zone Number.
  2. Set the Change per second (%) rate for the Primary Zone Number.
  3. Set the Secondary Zone Number.
  4. Set the Daylight Exposure (%) for the Secondary Zone Number (allowed range 10-100%).  This number represents the percentage of perceived ambient daylight at the Secondary Zone.
    • The Change per second (%) setting for the Secondary Zone is read only and automatically adjusts according to the relationship between the Daylight Exposure (%) in the Primary and Secondary Zone, as well as the Primary Zone Change per second (%) setting.