How does the integrating sphere measure LED lights

Integrating sphere is a hollow sphere with white diffuse reflective material on its inner wall, which is also called photometric sphere, luminous flux sphere, etc. One or several window holes are opened on the ball wall, which are used as light inlet holes and receiving holes for placing light receiving devices. The inner wall of the integrating sphere should be a good sphere, and its deviation from the ideal sphere should not be greater than 0.2% of the inner diameter. The inner wall of the ball is coated with an ideal diffuse reflection material, that is, a material with a diffuse reflection coefficient close to 1.

The working principle of integrating sphere:
The light is collected by the integrating sphere through the sampling port, as shown in the figure below. After multiple reflections inside the integrating sphere, the light will exist in all positions inside the integrating sphere very evenly. When using the light in the integrating sphere to measure, it can make our measurement results more reliable. The advantage of using the integrating sphere structure is that it can reduce and eliminate the measurement error caused by the shape of the light, the divergence angle, and the difference in the responsiveness of different positions on the detector

How does the integrating sphere measure LED lights?
1. Preparation. Prepare an integrating sphere of appropriate size, a standard light source close to the luminous flux of the light source of the lamp, and the ambient temperature is about 25 degrees to avoid wind blowing into the integrating sphere;

2. Inspection. Install the standard light source into the integrating sphere, connect the current source and power meter, and then light up the standard light source. Adjust the integrating sphere software operation interface to continuous test until the luminous flux reaches stability, and record its luminous flux value;

3. Calibration. The operation of calibration is similar to that of inspection, except that zero calibration should be carried out before lighting the standard light source. After the light flux is stable, input the standard color temperature and standard luminous flux of the standard light source in the integrating sphere software operation interface, and then click Start calibration, and the integrating sphere tester will automatically complete the calibration;

4. Test samples. Install the sample into the integrating sphere, light the sample, close the integrating sphere, and start the test. After the light flux is stable, record the value.

LISUN lauched 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 accruacy than the traditional integrating sphere.

LPCE-2(LMS-9000) High Precision Spectroradiometer Integrating Sphere System

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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