Go Direct® Light and Color Sensor (GDX-LC)
Specifications and User Guide

– Primary Test: Press the power button on the sensor to turn it on. The LED will flash red. Start the Graphical Analysis app on your device and select the desired sensor from the list of available sensors. If connecting via Bluetooth wireless technology, the LED will be steady blue. Select the desired channel(s) from the list of available sensors. Expose the light aperture to a variety of UV, visible light, and/or colors and confirm that the sensor reading responds appropriately. Press the power button to toggle the white LED on and off.


How do I turn the Go Direct Light and Color sensor white LED on or off?
What does the UV sensor in my Go Direct Light and Color sensor measure?
What do the 650 nm, 550 nm, and 450 nm channels measure in the Go Direct Light and Color sensor?
What are the units the Go Direct Light and Color Sensor is reading?

If the sensor can be turned on when connected by USB but not when disconnected from USB, the battery either needs charging or has reached its end of life and can no longer hold a charge. First, try charging the sensor for several hours. If the sensor still won’t turn on when disconnected from USB, the battery has likely reached its end of life. If you intend to use this sensor wirelessly, the battery will need to be replaced. The rechargeable battery in this sensor is covered by a one year warranty but should last two to five years in typical use.

Note that Graphical Analysis may also say that there is a firmware update available for the device when the battery has reached end of life.  If you see this message when working with a battery that needs replacing, it is simply an indication that you need to replace the battery. A firmware update is not required.


Visible Light Sensor
Range: 0 to 150,000 lux
Maximum sampling rate: 1,000 Hz
0.2 lx when measuring less than 10,000 lux
5 lx when measuring greater than 10,000 lux

UV Sensor
UV wavelength sensitivity region (approximate half-sensitivity): 320 nm to 375 nm
Units of measurement are mW/cm2 but are reported as relative values due to the non-uniform response of the sensor over the UV spectrum.
Maximum sampling rate: 1 Hz
Response time: 0.4 s

RGB Sensor
Peak response: 615 nm peak (red); 525 nm peak (green); 465 nm peak (blue)
Maximum sampling rate: 0.5 Hz

-Response time:
-Maximum wireless range: 30 m (unobstructed)

Sensor dimensions:
-Overall device dimensions: 8.8 cm x 6.0 cm x 3.2 cm

Go Direct Light and Color uses Bluetooth low energy technology and can only be used wirelessly with devices that support Bluetooth low energy technology running the appropriate software. Otherwise, connect the sensor to your device using the included USB cable.

This sensor requires LabQuest App running on a LabQuest 2 or LabQuest 3, or Graphical Analysis or Graphical Analysis Pro apps running on iOS iPadOS, Android, Chrome, Windows, or Mac.

-Calibrate? No. The sensor is set to the stored calibration before shipping.
-If you wish to calibrate the sensor, you will need to conduct a two-point calibration.

Go Direct® 300 mAh Replacement Battery (GDX-BAT-300)
Micro USB Cable (CB-USB-MICRO)

Micro USB to USB-C Cable (CB-USB-C-MICRO)
Light Sensor (LS-BTA)
UVA Sensor (UVA-BTA)
UVB Sensor (UVB-BTA)