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https://www.lisungroup.com/news/technology-news/application-and-overview-of-the-lisun-zy-3-needle-flame-tester.html

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Why is lm-79 the standard for street light measurements

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  LM-79 Intensity measurements are luminous intensity (measured in candela) taken from various angles all around an LED light source. It can combine this group of candela values to calculate zonal or total lumens, which may be used to make illuminance predictions within an application. The LM-79 standard is used mainly for measuring light by how it is perceived by the human eye (photometry or photometric measurement). The standard outlines the testing apparatus, procedures, and circumstances it must follow to make precise and repeatable measurements of the amount of light produced by LED goods and the amount of electrical power such products use. Generally, it may break down the testing techniques into two categories: angularly scanned and integrated (also known as goniometer measures) and measurements that use integrating spheres. This standard's very first iteration had the number. LM-79-08, and it was released to the public in the year 2008. The updated version of the sta...
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How the LISUN goniophotometer can help you measure light intensity and distribution

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An automotive goniophotometer is a device that can measure the light that is emitted by a light source when seen from varying angles. The phrase "goniophotometer" originates from the combination of the terms "goniometer," which measures angles, and "photometer," which measures light. The angle and the amount of light are measured by the goniophotometer's apparatus, which is the same equipment. A goniophotometer is an instrument that measures the distribution and the photometric qualities of light produced from a light source at various angles. The goniophotometer can measure the brightness (cd/m2), the light intensity flux , and the light intensity (candela). Using the data on the amount of light, it is feasible to compute the lumen value of a light source. The measurements of light's intensity were measured at a variety of angles relative to the source of the light. Mathematical computations are used to determine total light output, measure...
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Probe Test A tamper-resistant receptacle shall not permit contact to be made between the probe test shown in Figure 132.1 and Figure 132.2 and any live part of the receptacle through the outlet slots when tested as described in this section. Twelve previously untested devices are to be used for this test. The probe test shown in Figure 132.1 is to be applied to each of the outlet slot openings of the receptacle with a force of 8 ounces (2.2N) in an attempt to bypass the tamper-resistance mechanism. A suitable indicating device (such as an ohmmeter, battery-and-buzzer combination, or the like) is to be connected between the probe and the wiring terminal of the outlet slot being tested to determine whether contact is made. Small Probe Test of UL498 Figure 132.1 The probe test is to be manipulated in the outlet slots in any orientation that may permit access to live parts within the receptacle. Twelve devices previously tested in 132.2 are to be used for this test. The probe test shown in...
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