... Sphere 1M diameter, EVERFINE famous brand,It is used to test lamp's lumen, consumption. Power factor, input current ... Ra index.Hi-pot tester, It is used to test lamp's Hi-pot from 1000V-4000V. EMC tester ... s final assembling, before final package, each lamp we test its working.3). Third, after package, we inspect ... Beam angle of a bulb gives an idea of how the light beam spreads away from the beam center ...