Development of an Integrated Sphere LED Measurement System

Integrating sphere, also known as a LED Measurement System, is a hollow spherical shell. Integrating spheres are usually made of metal materials and have an inner wall coated with a white high diffuse reflectance layer (typically magnesium oxide or barium sulfate), ensuring uniform diffuse reflection at every point on the inner wall. There are also integrating spheres made of high reflectance polymer materials, such as Spectralon. The illuminance produced by a light source at any point on the sphere wall is the result of the superposition of multiple reflected light illuminances. In this way, the light entering the integrating sphere undergoes multiple reflections on the inner wall, creating a uniform illuminance on the inner wall. Integrating spheres are commonly used to test parameters such as light flux, color temperature, and luminous efficacy of light sources, as well as to measure the reflectance and transmittance of objects.

In recent years, with the increasing demand for quality in lighting products, the integration of constant temperature integrating spheres and LED color and electrical testing technology has emerged. The constant temperature integrating sphere is a device that can stably control the temperature and humidity of the test environment, while LED color and electrical testing evaluates the quality of LED lights by detecting their color and electrical parameters. By integrating these two technologies, the efficiency of LED product development and production can be effectively improved, promoting the development of the LED industry.

The constant temperature integrating sphere is commonly used in the lighting industry as a testing device, providing a stable temperature and humidity environment to ensure the reliability and consistency of test results. This is crucial for the performance testing of LED products. LED color and electrical testing is a technology that detects the color and electrical parameters of LED lights. Through this testing, parameters such as color temperature, color uniformity, brightness, and current of LED lights can be obtained to assess their quality. By using the constant temperature integrating sphere and LED color and electrical testing technology together, LED lights can be comprehensively and accurately tested in a controlled environment, ensuring product performance and quality.

In LED color and electrical testing, the role of the constant temperature integrating sphere primarily lies in controlling the stability of the test environment. The ideal conditions for a constant temperature integrating sphere are as follows:
A. The inner surface of the sphere is a complete geometric sphere, with a constant radius at every point.
B. The inner wall of the sphere is a neutral and uniformly diffuse surface, with the same diffuse reflectance for light of all wavelengths.
C. There are no objects inside the sphere, and the light source is considered to emit light without any physical material.

Factors that affect the measurement accuracy of the constant temperature integrating sphere are as follow:
A. The inner wall of the sphere is a uniform ideal diffuse layer that follows Lambert’s law.
B. The reflectance of each point on the inner wall is equal.
C. The diffuse reflection of the white coating on the inner wall is neutral.
D. The radius of the sphere is uniform, and there are no other objects inside the sphere except the light source.
Therefore, any damage, peeling, or yellowing of the inner wall of the integrating sphere will affect its measurement accuracy.

LED color and electrical testing can provide a comprehensive evaluation and optimization for LED products. The color of LED lights is represented by color temperature and color uniformity, which are crucial parameters for the comfort and visual effects of lighting products. Through LED color and electrical testing, the color temperature and color uniformity indicators of LED lights, as well as key parameters such as brightness and current, can be quickly and accurately obtained. These data are of great significance for product design and production decision-making.

Furthermore, the innovative integration of the constant temperature integrating sphere and LED color and electrical testing can bring the following advantages:
1. Improved accuracy and reliability of testing: The constant temperature integrating sphere can provide a stable testing environment, eliminating the influence of external factors on test results, thus improving the accuracy and reliability of testing. LED color and electrical testing can comprehensively evaluate the color and electrical parameters of LED products and ensure the accuracy of test results.

2. Improved consistency and quality of products: The integration of the constant temperature integrating sphere and LED color and electrical testing can eliminate variations in LED products during the production process, improving the consistency and quality of products. By accurately assessing the color and electrical parameters of LED products, quality issues can be timely identified and addressed, improving product reliability and meeting consumer demand for high-quality products.

3. Increased efficiency in development and production: The constant temperature integrating sphere provides a stable testing environment, reducing errors during testing and improving testing efficiency. LED color and electrical testing can comprehensively evaluate the key indicators of LED products, helping researchers and production personnel make quick and accurate decisions, thereby improving development and production efficiency.

4. Promoting the development of the LED industry: LED lighting is the future trend in lighting, and with the increasing demand for energy-saving and environmentally friendly lighting products in the market, the LED industry has broad development prospects. The innovative integration of the constant temperature integrating sphere and LED color and electrical testing can improve the quality and performance of LED products, meeting market demands and promoting the upgrading and development of the LED industry.

In conclusion, the innovative integration of the constant temperature integrating sphere and LED color and electrical testing brings many advantages to the LED industry, including improved testing accuracy and reliability, enhanced consistency and quality of products, increased efficiency in development and production, and the promotion of the LED industry. This integration not only applies to the LED lighting industry but can also be extended to other fields, providing new solutions for product development and production in various industries.

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. The LPCE-2 system is applied with LMS-9000C High Precision CCD Spectroradiometer or LMS-9500C Scientific Grade CCD Spectroradiometer, and a-molding integrating sphere with holder base. This sphere is more round and the test result is more accruate than the traditional integrating sphere.

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)