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.
Care and Maintenance
To ensure longest battery life, turn white LED off when not in use.
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.
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-BLUE Sensor: The UV-BLUE sensor uses the difference in readings between two photodiodes. One photodiode has a wide response including the UVA region, and the other is only sensitive to visible light. The difference creates a response primarily in the UVA region, but it does extend slightly into the blue end of the visible light spectrum. This sensor will provide a non‑zero response to some deep‑blue (but visible) light sources, such as fluorescent light bulbs.
Note: If the label for the UV sensor is anything other than “UV-BLUE” then the sensor has a half-sensitivity range from 320 nm to 375 nm — spanning most of the region considered to be UVA. This sensor does not respond significantly to the visible light spectrum.
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).