Error analysis of UGR measurement values in classroom tests 1. The part tested with a illuminance meter mainly includes the average and uniform illumination of the classroom work surface and blackboard. 2. The power density of classroom lighting, this part is mainly tested using a power meter. 3. It is the UGR test, this part mainly uses a luminance meter to test the original data, and then obtains the final UGR value through complex calculations. Below I will mainly analyze some errors generated during the UGR test process. According to the relevant standard GB 50034-2004 (Architectural Lighting Design Standard), we can know that the main requirements for UGR testing are as follows (the test location diagram is shown in Figure 1). UGR is a psychological parameter that measures the subjective reaction of discomfort caused by the light emitted by the lighting device in the visual environment to the human eye. Its value can be calculated according to the following formula:
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