Open Colorimeter LED Boards

We have developed a range of UV, visible and IR LED single-wavelength boards which can be used with the Open Colorimeter instruments. The LED boards include an on-board voltage regulator which enables operation from 3.3V to 5V input voltage. An active 16mA (or 24mA) constant current LED driver maintains stable LED current.

PCB Specifications

PCB dimensions: 25.4 mm x 20 mm x 1.6 mm
Two 4-pin JST SH connectors
Four M2.5 through holes for easy mounting
Surface mount or radial LED mounted in the center
Open Hardware design: https://github.com/iorodeo/i_control_led

White LED board (LEFT) and 275nm LED board (RIGHT)

LED Specifications

We collect spectral data for each LED board using an Ocean Optics spectophotometer. Irradiance data is also collected using the irradiance measurement option in the Open Colorimeter firmware. For convenience all of this information is available in the gallery linked below. In addition to measured data, you can also find more LED specifications from the manufacturer and links to datasheets.

View Gallery of LEDs

Plot of irradiance data for all visible and IR LEDs. ● = Radial ▲ = surface mount

Instructions for changing LED boards can be found on the Getting Started Guide page.

Note: The Multichannel Open Colorimeter uses the AS7341 sensor with filters providing the different wavelength channels. The default white LED board shipped with this Colorimeter version is suitable for this instrument. However, you can probably still customize it to improve specific channel sensitivity though we haven't tested that.

View LED Product Details

Open Colorimeter Product Guide

Documentation site for the Open Colorimeter, Multi-Channel Colorimeter, UV Open Colorimeter & Open Colorimeter Plus

Product Guide Home Page