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17 Sep, 2022 36 Views Author: LISUN

How to choose the right lumen sphere for your needs

Integrating sphere is a kind of sphere that can be used to test: luminous flux, color temperature, light effect and other parameters of light source. Its working principle is that the light is collected by the integrating sphere through the sampling port, and scattered in the integrating sphere after multiple reflections. When using the integrating sphere to measure the luminous flux, the measurement result can be more reliable. The integrating sphere can reduce and eliminate the measurement error caused by the shape of the light, the divergence angle, and the difference in the responsivity of different positions on the detector.


The basic structure of the integrating sphere is an internal hollow sphere made of aluminum or plastic lamps. The inner wall of the ball is uniformly sprayed with multiple layers of neutral diffusing materials, such as magnesium oxide, barium sulfate, polytetrafluoroethylene, etc. A plurality of holes are wiped on the ball as incident light holes, detectors and light source lamps. In order to prevent incident light from hitting the detector, a shielding screen is also installed in the ball. During measurement, standard lamps, auxiliary lamps, optical fiber interfaces, etc. are placed inside the integrating sphere, and external equipment includes spectrum analyzer, power supply, computer, etc.

Lumen is a physical unit describing luminous flux, which is explained by physics as the total emitted luminous flux generated by a candela (CD, candela, luminous intensity unit, equivalent to the luminous intensity of an ordinary candle) at a solid angle (the angle represented by the cone corresponding to a unit sphere with a radius of 1 meter and a spherical crown of 1 square meter, which corresponds to the center angle of the middle section of about 65 °).

Formula of luminous flux

How to choose the right lumen sphere for your needs?
We know that the brightness of LED lamps of different quality is different. It is difficult to directly define how much brightness each watt of LED lamps can emit. However, most brands of lamps have a brightness parameter called initial luminous efficiency. For example, the bulb of our 168 brand has an initial luminous efficiency of 95lm / W, that is, a 10 watt bulb lamp can emit 950lm of light, which is called luminous flux. If 100 lumens is exactly the brightness required for each square meter of the living room. For a living room of 20㎡, the luminous flux of only 2000 lumen lamps can be met. There is a manual to query the luminous flux required by the specific environment, which will be described later. Back here, a room of 20 square meters needs about 25W LED lamps. The 25W here can be a 25W LED lamp, or the total power of multiple lamps can reach 25W. This refers to the actual power. Considering that not all lamps are 100% power, For example, the bulb of our 168 brand is 90% power, and most of the bulbs in the market are only 70% power, while the bulb of a certain treasure or a certain number is even 30% power. Therefore, you need to calculate how many watts of lamps you buy. And because the luminous efficiency of different lamps is different, it is conservative for us to choose 30W products when we really buy them. If it is a bedroom, the demand for brightness is smaller, about 90lm /㎡. If a bedroom of 15㎡, the required brightness is 1350lm. The efficiency of the LED lamp is 100lm / W, so a 13.5w LED lamp is needed here. The study needs reading and writing. Does it need brighter light? This is not the case. If the lamp is too bright, it will make people feel dazzling. Therefore, the brightness demand in the study is also 100lm /㎡.

LISUN lauchedLPCE-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 177CIE84,  CIE-13.3IES LM-79-19Optical-Engineering-49-3-033602COMMISSION DELEGATED REGULATION (EU) 2019/2015IESNA LM-63-2IES-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.

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

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 177CIE84,  CIE-13.3COMMISSION DELEGATED REGULATION (EU) 2019/2015IES LM-79-19Optical-Engineering-49-3-033602IESNA LM-63-2ANSI-C78.377 and GB standards

CCD Spectroradiometer Integrating Sphere Compact System LPCE-3

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 GoniophotometerIntegrating SphereSpectroradiometerSurge GeneratorESD Simulator GunsEMI ReceiverEMC Test EquipmentElectrical Safety TesterEnvironmental ChamberTemperature ChamberClimate ChamberThermal ChamberSalt Spray TestDust Test ChamberWaterproof TestRoHS Test (EDXRF)Glow Wire Test and Needle Flame Test.

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