Can we use LMS-6000 portable CCD spectroradiometer to test luminous flux lumen?

With the rapid development of LED lighting market, the competition becomes more and more intense. So more and more LED lighting manufacturers began to focus on the quality of their products in order to gain a greater share in the market. Thus, LED lighting test instruments became the indispensable equipment. On the LED test equipment, there are goniophotometer, integrating sphere, spectroradiometer, LED driver power tester, EMI & EMC test equipment, and IP waterproof, dustproof environmental test chamber and so on.

And goniophotometer, integrating sphere and spectroradiometer is the most common and also basic equipment, mainly used to test the LED luminaires photometric, colorimetric and electrical performance, such as lumen (luminous flux), luminous intensity distribution, luminous efficiency, correlated color temperature, color rendering index, voltage, power and other basic parameters. However, due to the price of these equipment is not cheap and it requires a certain size of the laboratory, many small and medium-sized manufacturers or companies that started LED industry turned to seek portable test equipment, such as LMS-6000 Portable CCD Spectroradiometer. There are various kinds of portable spectroradiometers on the market, with elegant appearance and built-in high resolution LCD display, and even can be as smart as the phone. But is it really capable of testing lumens?

Many portable spectroradiometers claim to be able to test the lumen value of LED lamps. However, according to the standard IES LM-79-08 Electrical and Photometric Measurements of Solid-State Lighting Products, in Section 9.0, it states that the total luminous flux (lumen) of the SSL product should be measured using an integrating sphere system or goniophotometer. As for which method to use, depending on the size and shape of SSL products, and whether needs to measure other parameters such as color, luminous intensity distribution and so on. In general, the integrating sphere system is suitable for testing integrated LED lamps and relatively small LED luminaires (refer to Section 9.1.2 about the method for measuring the size of SSL products measured with the specified size of the integrating sphere) total luminous flux and colorimetry. The integrating sphere system has the advantage of fast measurement and no darkroom, and the result of the total luminous flux is a relative value because the final measurement result is calculated by comparison with the reference standard. Goniophotometer is usually used to measure luminous intensity distribution, and then resulting total luminous flux, thus it is an absolute value, and the measurement results are more accurate. It can measure the total luminous flux of not only small SSL products but also relatively large (as opposed to traditional fluorescent lighting) SSL products. Goniophotometer needs to be installed in the usual temperature control of the darkroom, to avoid the measured light source to absorb heat and other stray lights’ reflection to affect the measurement results.

Therefore, theoretically using a LMS-6000 Portable CCD Spectroradiometer to test lumen is not feasible, because the lack of the corresponding test environment, the measurement results will be a great error. In order to fulfill customers’ requirement of testing luminous flux (lumens) with limited budget, Lisun developed an economical compact integrating sphere spectroradiometer system, to provide customers with the best solution. The LPCE-3 CCD Spectroradiometer Integrating Sphere Compact System integrates the equipment and cabinet into ALL-IN-ONE, so there’s no need to install, and it is more convenient and easy to operate. Also it saves a lot of space. The sphere can be dismantled into two parts, which is easier for transportation, especially at offices or laboratories with smaller door sizes. In addition, this integrating sphere comes with a removable test holder base inside, and it can withstand 20kg weight. Also, it can install and replace different light fixtures for measurement according to different types of light sources, which is very simple and convenient, please refer to the following figures.

LPCE-3CCD Spectroradiometer Integrating Sphere Compact System



LPCE-3CCD Spectroradiometer Integrating Sphere Compact System

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