What is LM-79 goniophotometry photometric measurement?
Intensity meters like the LM-79 may be used to determine how many candelas of light are emitted from different angles of an LED light source. Together, these candela measurements can be used to calculate total or zonal lumen production, or for illuminance forecast within an application. The test cannot begin until the device being tested (DUT) has been properly connected to a steady power source. The ideal temperature for the room in which the fixture will be installed is 25 degrees Celsius. Expect between 30 minutes and 2 hours for this. The LM-79 document provides specific guidance on the installation, calibration, and operation of the designated apparatus. Both integrating spheres and goniophotometers are mentioned briefly in LM-79 as two of the most important pieces of equipment that may be employed. To prevent inconsistencies and promote uniformity, goniophotometers of type C are the only kind allowed for use with LM-79. The DUT is stationary throughout these tests, and the