Rubetek Knowledge Base



Light sensor


Light sensor —device that helps to set up you Smart Home management depending upon light level. Create scenarios to automatically turn on the light when it gets dark in the room, to open the curtains when day is breaking Monitor illuminance level in a room during the day.

Free yourself from household chores, saving your time for more important things, with Smart Home devices from rubetek.

Receiver that will transmit commands to other devices of Smart Home and to rubetek Cloud is required for connection of sensor.

Available devices:

Wi-Fi plug RЕ-3305

Wi-Fi single switch relay RЕ-3313

Wi-Fi single switch relay with dry contact RЕ-3314

Wi-Fi double switch relay RЕ-3315

Control module RM-3715

Principle of operation

The sensor monitors the level of light in its field of vision. Light beams are focused by a photoelectric cell and directed to the sensor. When a certain brightness threshold is reached, the Sensor sends a radio signal to the receiver, and then triggers a scenario of Smart Home system components or sends a command to rubetek Cloud.
Sensor triggering notification will be send only if mode “security” is activated.


Display of sensor readings in application
Two-way communication and display of signal quality with receiver
Push- and SMS- notifications on reaching set illuminace values
Statistics of illuminace level in a room for different periods
Push- and SMS- notifications at tampering and at low sensor battery
Diagnostics of sensor functionality every 30 minutes
Display of the name and sensor location room in notification
Lifetime up to 2 years without battery change

Structure diagram

  • 1
    LED indicator

  • Battery compartment

  • 1
    Battery fastening
  • 1
    Tampering sensor button
  • 1
    Battery compartment cover

  • Installation

    1. Open cover of battery compartment by picking up the groove and insert the battery (supplied) with the "+" sign upwards. Close the cover.

    1. Install sensor on flat and clean surface by means of double-sided tape, included in the scope of supply.

    Before locking the position of sensor by means of double-sided tape, add it in rubetek application.

    Mobile app

    Download and install rubetek application from App Store or Google Play. You can use QR-code.
    Create an account and confirm your mobile number to use the application.

    Adding to application

    1. Open rubetek application.
    2. Add receiver in application, if it was not added before
    3. Press “+” in top right angle of the main screen
    4. Select “Add Device”

    1. Select section Lighting → Sensors → Light sensor RL-3201

    1. Press and hold button more than 5 sec. to put sensor in adding mode. Diode on front side shall start flashing


    Find below all possible conditions of sensor tile on the main screen.


    Light sensor
    Current value of illuminace level


    Light sensor
    Change battery

    Light sensor
    Not available
    Sensor is not available 30 minutes or more

    Light sensor
    Sensor housing tampering


    You can see statistics of illuminace level for different periods in application. Schedules are displayed on the main screen. Monitor illuminace level in a room during the day. The lack of light can be detrimental to your health.


    You can automate your smart devices by creating scenarios in the rubetek mobile app.

    1. Press “+” in top right angle of the main screen
    2. Select "Add Automation" from the bottom pop-up menu

    1. Set scenario name so that it is not confused with others
    2. Create conditions of scenario activation: If -> Device status-> Illuminace sensor -> Light sensor.

    1. Specify the action that will occur if the condition is met: Then → Device condition → Relay → Switch on

    Illuminace level

    The sensor registers the illuminace level in lux. You can set up display of measurement results in percents in application.

    Below are the recommended room illuminace levels in lux and their corresponding percentage values (applicable to the RL-3201 Sensor only).

    Drawing room, bed room
    Kitchen, dining-room
    Children’s room
    Store room, housekeeping room
    Dressing room
    Bath room, toilet
    Interior corridor

    Below are the recommended room illuminace levels in lux and their corresponding percentage values (applicable to the RL-3201 Sensor only).

    > 1000
    100 - 130
    10 - 13
    0 - 50
    0 - 5

    Other opportunities

    Improve your comfort, adding other rubetek devices to illuminace sensor. For example, in conjunction with control relays RE-3313 or RE-3315, you can create an autonomous lighting control system in your home. Connect your home light sources to the relay and create a scenario to switch them on/off depending on the status of the sensor.

    If you have an electric curtain rod, connect it to the RE-3315 and create a scenario for it to open when morning is coming. In this case light sensor shall be placed near window frame.

    In conjunction with motion sensor RS-3205, you can create a complex home lighting control system. It will be guided not only by motion in the room, but also by the level of light.

    Monitor outdoor light sources according to sensor readings. Install it on window frame inside room, connect street lamps to power line using relays RE-3313 or RE-3315 and create their operation scenario depending upon outside illuminace level .


    Press and hold the tile on the screen to open sensor settings.

  • 1
    Sensor name
  • 1
    Location room
  • 1
    Selection of illuminace units of measurements
  • 1
    Notifications settings
  • 1
  • 1
    Hide/display the sensor on the main screen
  • 1
    Add to/remove from Favorites
  • 1
    Battery charge level
  • 1
    Last activity
  • 1
    Event log
  • 1
    Advanced device data
  • 1
    Delete Sensor from the Home app

  • With a one scale division signal, we do not guarantee stable operation of the security system. Move the device to improve signal quality.

    When the battery level is less than 15%, you will be notified to replace the battery.

    The signal transmission power is automatically set uped and directly affects the battery life.

    Event log

    The "Events" tab displays the chronology of sensor triggering with its name and room location. Also here are messages about low battery power, tampering attempts, and notifications about the triggering of other devices, if any. Tab is in the lower application menu.

    Push notifications

    To use this function you should permit rubetek application to send push notifications. You can do it in your mobile phone settings.


    Why is the battery dead faster than 3 years?
    Battery life is affected by a number of factors: ambient temperature, level of communication with the receiver, and installation location.
    How can I check that sensor is functioning?
    The device communicates with receiver every 30 min. to check functionality. Check the date and time of the last check in the sensor settings (Last Activity).
    Why don't I get push and SMS-notifications about sensor triggering?
    Check communication level of sensor and receiver. Also make sure that your smartphone settings are enabled to allow notifications from the rubetek mobile app.
    Why aren't the light level readings updated in the app?
    Check communication level of sensor and receiver. Check that the sensor is not located near metal objects or other obstacles that interfere with the radio signal.
    Where shouldn't the sensor be installed?
    Neal metal objects, causing radio signal attenuation.

    If you can't solve the problem yourself, contact technical support at or by phone at 8 800 777-53-73.


    Model RL-3201
    Connection type RF 868 MHz
    Operation range up to 200 m at open territory
    Measurement limits from 0 to 32767 lux
    Operating voltage 3 V
    Power component Battery CR2450
    Battery life-time up to 3 years
    Operating Temperature 0°C…+40°C
    Operating humidity up to 80% (no condensation)
    Installation place indoor
    Mobile app You can't add it directly to the mobile app. Receiver is required (Wi-Fi device, supporting sensor adding function)
    Overall dimensions 45×45×29 mm
    Weight 22 g

    Content of delivery

    Light sensor RL-3201 1 pc
    Battery CR2450 1 pc
    3M tape 1 pc
    Pin 1 pc
    Warranty card 1 pc
    Manual 1 pc


    Declaration of Conformity ЕАЭС N RU Д-RU.РА03.В.58392/21
    Validity 17.12.2021-15.12.2026
    Certification body Испытательная лаборатория ООО «АЛЬФА»
    Complies with the requirements ТР ТС 020/2011 «Электромагнитная совместимость» технических средств ТР ЕАЭС 037/2016 «Об ограничении применения опасных веществ в изделиях электротехники и радиоэлектроники»