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LED Color and Photometry Measurements

OceanView Schematic Outlines Steps for LED Characterization

Greenhouse LEDsOceanView is the flagship software program for Ocean Optics spectrometers. Beyond simple data visualization, OceanView allows users to generate, customize and save spectroscopy projects using its Schematic View function. Saved projects can be reloaded or shared with others. The Schematic View presents each data processing step in a diagram format with icons representing the different devices and actions in your project. In the Schematic, you can view and manipulate the flow of data from your spectrometer through each of your processing steps. Data flow is represented by the use of arrows that connect different nodes. The nodes represent points where data is processed or manipulated.

In this project, we created an OceanView schematic for measuring emissive color and photometric quantities of LEDs used in greenhouse lighting.

About OceanView Schematic View

The Schematic View provides all of the functionality of the OceanView graph view, plus additional capabilities to customize your spectroscopy measurements:

  • More than 70 algorithm nodes enabling a range of math functions for basic and advanced calculations
  • Subrange node to specify a subset of the spectrum or a single wavelength
  • Interpolation of spectral data to output data at consistent, evenly spaced intervals
  • Scalar view for monitoring a single value such as TEC temperature or an integral or average over a specified wavelength range
  • Ability to preview spectra at every step in your process

Create, configure and connect schematic nodes to read data from devices, to transform and combine that data through a library of built-in spectroscopic functions, and then to output the results to visual graphs and Microsoft Excel-ready CSV files.

Project Description

In this setup, we used a Spark spectral sensor, an ultra-compact device that provides spectral output across 380-700 nm from its 1024 pixel array. Spark can be used for characterizing lamps and illuminants in the visible range, including LEDs and other sources.

Even intensity of illumination across the Spark aperture is recommended. For absolute measurements, the lighting and geometry of the setup must be identical when calibrating the device and when taking a measurement. Any variation from the calibration setup (moving of fibers, the light source or the device, or altering the background lighting) will nullify the calibration. This includes the intensity of illumination.

Background

LEDs are configured to stimulate plant growth in greenhouse environments. Horticulturists are interested in the effects of light on the growth of their crops, with much analysis of how the intensity of blue and red light affects the growth rate of various crops.

Until now farmers and horticulturists have been limited in their options to control and measure the illumination of their crops. But recently the horticultural industry has been experimenting with the addition of red, blue and white LEDs to existing illumination systems. The idea is to better tune the spectral content to match the needs of the crops.  Continuously monitoring the LED emission spectrum with a spectral device like Spark enables growth patterns to be correlated with the illumination spectra.

Project Import Procedure

Import the project into OceanView by going to File| Share project| Import. OceanView will guide you through the steps necessary to swap the spectrometer you are using into the project including allowing you to measure new reference and background spectra as needed for the different measurements.

For this project, we focused on emission measurements of color including dominant wavelength, chroma and hue; and photometric measurement of brightness characteristics such as luminous flux and intensity. PAR measurements are also possible. Photosynthetically active radiation (PAR) is a measure of the amount of incident light that is absorbed by a plant and contributes towards photosynthesis.

Schematic View

Figure 1. A procedure for determining emissive color and photometry values was implemented in the OceanView schematic.

Click on the image to enlarge.

Project

Figure 2. Calculation of color and photometric units of measure was accomplished in OceanView software.

Click on the image to enlarge.

Additional OceanView Schematics

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