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Light2D v1.1 $31.36US
2 - 6 : $29.79US ( save 5% )
7 - 19 : $28.22US ( save 10% )
20 + : $25.09US ( save 20% )
excl. sales tax

Measure the intensity of ambient light with this sensor that approximates the human eye response curve to light. It can separately measure infrared and full-spectrum (infrared and human-visible) light. A digital I2C sensor, that outputs cailbrated, high resolution, low-noise signals.

Application examples

  1. Measure room or ambient lighting.
  2. Put fish in a bowl with lights below and let the fish shadows play music (fish not included).
  3. Combine with the Hot, Air2D and Humid sensors to create a meteorological station. Add soil Moisture sensors and Switches to control valves for watering your plants.

Technical specifications

Product Light2D sensor
Version 1.1 (February 2021)
Sensing parameter ambient light, illuminance
Sensing method photodiodes: broadband (visible plus infrared) and infrared-specific photodiode
Active volume approx. 120 ° cone
Spectral response range approx. 300 to 1000 nm
Illuminance range 0.1 to 40,000+ Lux
Response time 15 to 400 ms (dependent on integration time)
Power supply 4.75 - 5.25 V, 0.5 mA at 5 V
Operating temperature -30 to 80 ºC (-22 to 176 ºF)
Dimensions 22 x 15 x 5 mm (0.87 x 0.60 x 0.2 inch)
Mounting two 3.0 mm (0.12 inch) mounting holes spaced 8 mm (0.3 inch) apart
Cable 1.0 m (39 inch), shielded, red wire = power, black wire = ground, grey wire = I2C data (SDA), white wire = I2C clock (SCL), extendable at least 4 m (13 ft) with ExtendCableD-01 and 10 m (33 ft) with ExtendCableD-10
Connector male 1x4 plug with 4 pins in a row spaced 2.54 mm (0.100 inch)
Weight 11 g (0.39 oz), incl. cable
Software support
  • 23 Jul 2019: Light2D v1.12 for MacOS and Windows from source code in Max. For multiple sensors or sensor outputs, run multiple instances of the application, each started in its own folder. Requires a digitizer with firmware v7.61 or higher (but lower than v8.00) or v8.11 or higher. Use together with Connect (MacOS / Windows).
Application notes
  1. Make sure the sensor is plugged into the digitizer with the red wire connected to power. Reversing the plug may cause damage to the sensor.
  2. Requires a digitizer with digital (I2C) ports, eg. the USB-microDig or the Wi-microDig.
  3. The default I2C address is 57 (0x39). Both I2C lines have 10 kOhm pull-up resistors.
  4. Our software enables you to use most features of this sensor.
  5. See the Light2D function description in the firmware documentation for more details about the various methods available in host and standalone mode.
  6. For more technical specs, and to find out how to access the sensor data in detail, please consult this datasheet.
  7. To extend the cable, use ExtendCableD-01 and/or ExtendCableD-10.

This page was updated on Saturday 13 May 2023.
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