By: Lumentra  09-12-2011
Keywords: Color Rendering, Photometric Testing, Radiometric Measurements,

Lumentra offers a sophisticated array of photometric and radiometric measurements tailored specifically for LED industries. Our optical services include:

Radiometric measurements

Radiometry is concerned with the energy or the power of optical radiation for a given geometry of propagation. The spectrum covers the full range from UV to infrared light and is therefore independent of the sensitivity of the human eye to brightness and color. We test luminaires for the following basic quantities:

  1. Radiant power
  2. Radiant intensity
  3. Irradiance
  4. Radiance

Photometric measurements

Each radiant quantity has a corresponding photometric quantity which takes into account the spectral response of the human eye to visible radiation. Photometric testing of SSL luminaires is of  great importance for most applications. Our testing includes comprehensive analysis of photometric quantities:

  1. Luminous flux
  2. Luminous intensity
  3. Illuminance
  4. Luminance

Colorimetry measurements

Colorimetry relates to the visual perception of color by the human eye and provides a quantitative and qualitative description of color. Our facilities allow for comprehensive testing of colorimetry aspects based on the CIE established procedures. These include:

  1. Color Rendering Index
  2. Correlated Color Temperature
  3. Color coordinates
  4. CIE Color diagram localization


Efficacy is the ability of an LED to convert electrical energy into optical energy. We provide efficacy measurements for SSL luminaires.

Keywords: Color Rendering, Photometric Testing, Radiometric Measurements,

Other products and services from Lumentra



We are equipped with state of the art thermal characterization facilities which enable us to provide the following thermal measurements. Accurate knowledge of the thermal characteristics of a SSL luminaire can therefore result in improved performance and longer lifetimes. Thermal effects have a significant impact on the performance of SSL devices. We provide extensive computer thermal modeling of luminaires.



As the LED is powered, a portion of the blue light from the LED will leak through the phosphor coating, while a fraction of it will be down-converted by the phosphor into the yellow region. Lumentra’s product development aims at providing LED white light with outstanding Color Rendering Index.



Lumentra’s measurement and calibration services are carried out in accordance with the following international standards. IES LM-79 - Electrical and Photometric Testing of Solid-State Lighting Devices. IES LM-80 - Lumen Depreciation of LED Light Sources. ANSI C78.377 - Chromaticity of SSL Products. Energy Star - Energy Efficiency for SSL.