Vernier Software and Technology
Vernier Software & Technology

Go Direct® Light and Color Sensor User Manual

Go Direct® Light and Color Sensor

This light sensor measures light in the visible and ultraviolet electromagnetic spectra. An RGB color sensor detects relative contributions of primary colors in light. Go Direct Light and Color directly connects via Bluetooth wireless technology or wired via USB to your platform. The sensor can be used for the study of visible light intensity, UV light intensity, and color investigations.

Note: Vernier products are designed for educational use. Our products are not designed nor are they recommended for any industrial, medical, or commercial process such as life support, patient diagnosis, control of a manufacturing process, or industrial testing of any kind.

What's Included

  • Go Direct Light and Color
  • Micro USB Cable

Compatible Software

The Go Direct® Light and Color Sensor may require a compatible interface and software. Choose a platform below to see compatible interface and software options.

Getting Started

Please see the following link for platform-specific connection information:

Bluetooth Connection

USB Connection

  1. Install Graphical Analysis 4 on your computer, Chromebook™, or mobile device. See for software availability.
  2. Charge your sensor for at least 2 hours before first use.
  3. Turn on your sensor by pressing the power button once. The Bluetooth® LED will blink red.
  4. Launch Graphical Analysis 4.
  5. Click or tap Sensor Data Collection.
  6. Click or tap your Go Direct sensor from the list of Discovered Wireless Devices. Your sensor's ID is located near the barcode on the sensor. The Bluetooth LED will blink green when it is successfully connected.
  7. This is a multi-channel sensor. The active channel is listed in the Connected Devices Sensor Channels list. To change channels, select the check box next to the Sensor Channel(s) you would like to activate.
  8. Click or tap Done to enter data‑collection mode.
  1. If using a computer or Chromebook, install Graphical Analysis 4. If using LabQuest 2, make sure LabQuest App is up to date. See for Graphical Analysis 4 availability or to update LabQuest App.
  2. Connect the sensor to the USB port.
  3. Launch Graphical Analysis 4 or turn on LabQuest 2. You are now ready to collect data.
  4. This is a multi-channel sensor. To change the default channel selections, see

Charging the Sensor

Connect the Go Direct Light and Color to the included USB Charging Cable and any USB device for two hours.

You can also charge up to eight Go Direct Light and Color Sensors using our Go Direct Charge Station, sold separately (order code: GDX-CRG). An LED on each Go Direct Light and Color indicates charging status.


Orange LED next to the battery icon is solid while the sensor is charging.

Fully charged

Green LED next to the battery icon is solid when the sensor is fully charged.

Powering the Sensor

Turning on the sensor

Press button once. Red LED indicator next to the Bluetooth icon flashes when the unit is on. Press button again (after 5 second delay) to turn on/off the white LED.

Putting the sensor in sleep mode

Press and hold button for more than three seconds to put into sleep mode. Red LED indicator next to Bluetooth icon stops flashing when sleeping.

Connecting the Sensor

See the following link for up-to-date connection information:

Connecting via Bluetooth

Ready to connect Red LED next to the Bluetooth icon flashes when sensor is awake and ready to connect.
Connected Green LED next to the Bluetooth icon flashes when sensor is connected via Bluetooth.

Connecting via USB

Connected and charging Orange LED next to the battery icon is solid when the sensor is connected to Graphical Analysis via USB and the unit is charging. LED next to Bluetooth icon is off.
Connected, fully charged Green LED next to the battery icon is solid when the sensor is connected to Graphical Analysis via USB and fully charged. LED next to Bluetooth icon is off.
Charging via USB,
connected via Bluetooth
Orange LED next to the battery icon is solid when the sensor is charging. Green LED next to the Bluetooth icon flashes.

Using the Product

Connect the sensor following the steps in the Getting Started section of this user manual.

In order to turn on the white LED on the sensor face, wait five seconds after initially turning the sensor on and press the button once. A single press will toggle this LED on and off.


Click on the sensor icon to select other channels for this sensor, including

  • UV
  • 615 nm (Red)
  • 525 nm (Green)
  • 465 nm (Blue)


Light intensity range

0 lx to 150,000 lx

Maximum light intensity sampling rate

1,000 samples/s


  • ±0.2 lx (when using in less than 10,000 lux);
  • ±5 lx (when using in greater than 10,000 lux)

UV sensitivity range

320 nm to 375 nm

Red, green, blue intensity range

0 to 1,000 (relative scale)

USB specification

 USB 2.0 full speed

Wireless specification

 Bluetooth v4.2

Maximum wireless range

 30 m (unobstructed)


 8.8 cm × 6.0 cm × 3.2 cm


300 mAh Li-Poly Rechargeable

Battery life (single full charge)

~10 hours continuous data collection

Battery life (long term)

~300 full charge cycles (several years depending on usage)


Avoid pointing the white LED directly at your eye. The light is bright and may cause discomfort.

Care and Maintenance

To ensure longest battery life, turn white LED off when not in use.

Battery Information

The Go Direct Light and Color contains a small lithium-ion battery in the case. The system is designed to consume very little power and not put heavy demands on the battery. Although the battery is warranted for one year, the expected battery life should be several years. Replacement batteries are available from Vernier (order code: GDX-BAT-300).

Storage and Maintenance

To store the Go Direct Light and Color for extended periods of time, put the device in sleep mode by holding the button down for at least three seconds. The red LED will stop flashing to show that the unit is in sleep mode. Over several months, the battery will discharge but will not be damaged. After such storage, charge the device for a few hours, and the unit will be ready to go.

Exposing the battery to temperatures over 35°C (95°F) will reduce its lifespan. If possible, store the device in an area that is not exposed to temperature extremes.

Water Resistance

The Go Direct Light and Color is not water resistant and should never be immersed in water.

If water gets into the device, immediately power the unit down (press and hold the power button for more than three seconds). Disconnect the sensor and charging cable, and remove the battery. Allow the device to dry thoroughly before attempting to use the device again. Do not attempt to dry using an external heat source.

How the Sensor Works

Light Sensor: The sensor uses a silicon photodiode. It produces a voltage that is proportional to light intensity. The spectral response approximates the response of the human eye, as shown in this diagram.

UV Sensor: The sensor uses a photodiode sensitive to UVA light. It incorporates photodiode, amplifiers, and analog/digital circuits into a single chip using a CMOS process. When the UV channel is activated, it is able to detect UV intensity and reports this value as a relative term.

RGB Color Sensor: The color sensor uses a combination of sensors that have a peak response that corresponds roughly to red, green, and blue light. It incorporates photodiodes, amplifiers, and analog/digital circuits into a single chip using CMOS process.

The software analyzes the relative contribution of each primary light color based on a peak response of 615 nm for red, 525 nm for green, and 465 nm for blue. Each of the sensors will register a light intensity (relative units).


Press the power button on the sensor to turn it on. (The Bluetooth 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, the LED will be steady green. Click on the sensor icon and select the desired channel(s) from the list of available sensors. Expose the light aperture to a variety of UV, visible light, or colors and confirm that the sensor reading responds appropriately. Press the power button to toggle the white LED on and off.

View additional FAQ's related to this product at

Repair Information

If you have followed the troubleshooting steps and are still having trouble with your Go Direct Light and Color, contact Vernier Technical Support at or call 888-837-6437. Support specialists will work with you to determine if the unit needs to be sent in for repair. At that time, a Return Merchandise Authorization (RMA) number will be issued and instructions will be communicated on how to return the unit for repair.


Item Order Code
Micro USB Cable


Micro USB-C Cable


Go Direct 300 mAh Replacement Battery



Vernier warrants this product to be free from defects in materials and workmanship for a period of five years from the date of shipment to the customer. This warranty does not cover damage to the product caused by abuse or improper use. This warranty covers educational institutions only.


When disposing of this electronic product, do not treat it as household waste. Its disposal is subject to regulations that vary by country and region. This item should be given to an applicable collection point for the recycling of electrical and electronic equipment. By ensuring that this product is disposed of correctly, you help prevent potential negative consequences on human health or on the environment. The recycling of materials will help to conserve natural resources. For more detailed information about recycling this product, contact your local city office or your disposal service.

Battery recycling information is available at

Do not puncture or expose the battery to excessive heat or flame.

The symbol, shown here, indicates that this product must not be disposed of in a standard waste container.

Contact Support

Fill out our online support form or call us toll-free at 1-888-837-6437.

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