Light Measurement

Radiant develops integrated solutions for both R&D and production-line testing of intensity, illuminance, luminance, and chromaticity of various lighting sources. In R&D environments, compact goniometer systems combine imaging technology and application software to deliver fast, cost-effective, and comprehensive data, enabling lighting engineers to optimize their product designs and easily generate standard output files, including IES, EULUMDAT, or Radiant Source Model® (RSM) formats. On the production line, our test systems ensure product quality and consistency in real time, optimizing cost-efficiency and increasing yields.

LED Devices

LED Source Characterization

The physical structure of LEDs is more complex than most lamp sources. Accurate source models produced during the design of an LED-based system enable lighting engineers to achieve the desired performance of their design and verify assembly in production. Radiant’s integrated systems are comprised of an imaging colorimeter and precision goniometer with dedicated software to capture complete and precise characterization of the light source output. This data then be used for design evaluation and imported into any major optical design package, such as ASAP®, FRED®, LightTools®, LucidShape®, Photopia™, IES TM-25, Opticad®, OSLO®, SimuLux®, SPEOS®, TracePro®, and OpticStudio™ (ZEMAX), as well as general file formats.

Luminous Intensity Distribution Measurement

The output of an LED as a function of angle is the Luminous Intensity Distribution, a measurement with critical implications to the quality and usability of the LED. Luminous intensity distribution describes directionality of the light output and the power of light in each direction from the LED.

A key step in the production of encapsulated LEDs or LED-based optical assemblies is the alignment of the optics to the LED die. Improper alignment will alter the output of the LED and impact the overall performance of the system in which it is used. Our goniometric systems acquires data for all output angles from a source LED, enabling designers to define an objective standard for optimal system performance.

LED Arrays

Color and Brightness Testing in LED Arrays

LED arrays are found in a wide range of lighting products, including indicator lights, signage, and backlights. Our high-precision measurement systems help design engineers accurately characterize their product designs; they also test color and brightness for quality assurance in high-volume manufacturing operations. The nearly-monochromatic output of most LEDs has historically made it difficult to acquire accurate color and luminance measurement using systems based on color filters. Our systems combine highly-accurate filters with the unique patented ProMetric® Imaging Colorimeter calibration technology to yield accurate chromaticity measurements while delivering the benefits of a CCD-based system. Imaging colorimeters measure hundreds or even thousands of LEDs simultaneously.

Luminaires & Large Light Sources

View Angle Performance Characterization in Large Light Sources

Developers of large light sources for automotive, transportation, architectural, and other applications need to generate illumination distribution data for performance analysis, illumination modeling for lighting systems, or for manipulation in optical design software packages.

Radiant’s ProMetric Near-Field Measurement System (PM-NFMS™) is a complete goniometric system for large light source measurement and analysis. It measures brightness, color, CRI, and spectrum as a function of view angle by capturing a complete near-field model of the light source, delivering comprehensive data from a very compact system.


Related Links:

Source Imaging Goniometer® (SIG 400)

ProMetric Near-Field Measurement System (PM-NFMS)

White Paper: Efficient Measurement of Large Light Source Near-Field Color and Luminance Distributions for Optical Design and Simulation

On-Demand Webinar: Creating IES Files for Luminaires and Lighting Fixtures

On-Demand Webinar: Improving Color Measurement Accuracy for LED, Luminaire, and Display Imaging