Integrating Sphere & Spectroradiometer for Photometry

Lumen is a unit of measurement for the total amount of visible light emitted by a light source. It is an important parameter in lighting design and evaluation, as it reflects the brightness and effectiveness of a lighting system. To accurately measure lumen output, a spectroradiometer system with an integrating sphere is commonly used. In this technical article, we will discuss how to test lumen by integrating sphere spectroradiometer system.

LISUN LPCE-2 Integrating Sphere Spectroradiometer LED Testing System is for single LEDs and LED lighting products light measurement. LED’s quality should be tested by checking its photometric, colorimetric and electrical parameters. According to CIE 177, CIE84,  CIE-13.3, IES LM-79-19, Optical-Engineering-49-3-033602, COMMISSION DELEGATED REGULATION (EU) 2019/2015, IESNA LM-63-2, IES-LM-80 and ANSI-C78.377, it recommends to using an array spectroradiometer with an integrating sphere to test SSL products

An integrating sphere spectroradiometer system is a device used to measure the spectral and total radiant flux of a light source. It consists of an integrating sphere, a spectroradiometer, and a light source. The integrating sphere is a hollow sphere coated with a highly reflective material, such as barium sulfate or polytetrafluoroethylene (PTFE). It is designed to capture and diffuse the light emitted by the light source, ensuring that the light is evenly distributed and measured from all directions.

The spectroradiometer is a device that measures the spectral power distribution (SPD) of the light source. It uses a diffraction grating to separate the light into its component wavelengths and measures the intensity of each wavelength. The SPD data can be used to calculate various lighting parameters, such as color temperature, color rendering index (CRI), and lumen output.

Integrating sphere spectroradiometer systems are used for measuring the spectral radiance and color of light sources. These systems consist of an integrating sphere, a spectroradiometer, and associated software. The integrating sphere is a hollow sphere coated with a highly reflective material, such as barium sulfate, that is used to collect light from a source and distribute it evenly throughout the sphere. The spectroradiometer is used to measure the spectral radiance of the light inside the sphere, and the software is used to analyze the data and calculate color values.

 The spectroradiometer is used to measure the spectral distribution of the light. This is done by separating the light into its individual wavelengths, and measuring the intensity of each wavelength. The spectroradiometer consists of a diffraction grating, which separates the light into its individual wavelengths, and a detector, which measures the intensity of each wavelength. The spectroradiometer is calibrated using a standard light source, which ensures that the measurements are accurate and consistent. The light source used in the integrating sphere spectroradiometer system can be any type of light source, such as an LED, an incandescent bulb, or a fluorescent tube. The light source is placed inside the integrating sphere, and the light is allowed to fill the sphere. The light is then measured by the spectroradiometer, which provides a spectral distribution of the light.

The software used with the integrating sphere spectroradiometer system is used to analyze the data collected by the spectroradiometer. This software can calculate a variety of color values, including CIE chromaticity coordinates, CCT, and color rendering index (CRI). The software can also be used to compare the color values of different light sources or materials, making it useful for quality control and research and development applications.

Integrating sphere spectroradiometer systems are used in a variety of applications, including lighting design, color measurement, and quality control. In lighting design, the system is used to measure the spectral characteristics of different light sources, which can be used to design lighting systems that meet specific requirements. In color measurement, the system is used to measure the color of different materials, which can be used to ensure that products are consistent in color. In quality control, the system is used to ensure that products meet specific standards, such as the color temperature of a light source. There are several factors that can affect the accuracy of an integrating sphere spectroradiometer system. One of the most important factors is the size of the integrating sphere. The larger the sphere, the more light it can collect, which can result in more accurate measurements. However, larger spheres can also be more expensive and difficult to handle. Another factor is the quality of the reflective material used on the interior surface of the sphere. The more reflective the material, the more accurate the measurements will be. Finally, the spectroradiometer used in the system must be calibrated regularly to ensure that the measurements are accurate and consistent.

In conclusion, integrating sphere spectroradiometer systems are an essential tool for measuring the spectral characteristics of light sources. The system consists of an integrating sphere, a spectroradiometer, and a light source. The integrating sphere is designed to collect all the light that is emitted from the light source, and the spectroradiometer is used to measure the spectral distribution of the light. The system is used in a variety of applications, including lighting design, color measurement, and quality control. The accuracy of the system depends on several factors, including the size of the integrating sphere, the quality of the reflective material, and the calibration of the spectroradiometer.

LISUN LPCE-3 is a CCD Spectroradiometer Integrating Sphere Compact System for LED Testing. It is suitable for single LED and LED luminaires’ photometric, colorimetric and electrical measurement. The measured data meets the requirements of CIE 177, CIE84,  CIE-13.3, COMMISSION DELEGATED REGULATION (EU) 2019/2015, IES LM-79-19, Optical-Engineering-49-3-033602, IESNA LM-63-2, ANSI-C78.377 and GB standards.

To test the lumen output of a light source using an integrating sphere spectroradiometer system, follow these steps:
Step 1: Set up the integrating sphere spectroradiometer system
The first step is to set up the integrating sphere spectroradiometer system. This involves assembling the integrating sphere, connecting the spectroradiometer, and calibrating the system. The calibration process ensures that the system is accurately measuring the light emitted by the light source.

Step 2: Turn on the light source
Turn on the light source and allow it to stabilize for at least 15 minutes. This ensures that the light output is consistent and stable.

Step 3: Measure the spectral power distribution
Measure the spectral power distribution (SPD) of the light source using the spectroradiometer. The SPD data will be used to calculate the lumen output.

Step 4: Calculate the lumen output
Using the SPD data, calculate the lumen output of the light source. The lumen output is calculated by integrating the spectral power distribution over the visible spectrum (380-780 nm) and multiplying by the luminous efficacy of the light source. The luminous efficacy is the ratio of the total luminous flux emitted by the light source to the total power consumed.

Step 5: Repeat the measurement
Repeat the measurement at least three times to ensure accuracy and consistency. Take the average of the measurements as the final lumen output.

Conclusion
Testing lumen output using an integrating sphere spectroradiometer system is a reliable and accurate method for evaluating the brightness and effectiveness of a lighting system. By following the steps outlined in this technical article, you can ensure that your lumen measurements are accurate and consistent. Remember to always calibrate your system and take multiple measurements to ensure accuracy.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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Tags：LPCE-2(LMS-9000) , LPCE-3