Check your lux readings against the standard
Enter the average and lowest lux readings from a task area to see whether they meet the indicative BS EN 12464-1:2021 maintained illuminance (Ēm) and uniformity (Uo = minimum ÷ average) for that area.
How to read the result
A space can fail on the average (too dark overall) or on uniformity (patchy light, dark spots between luminaires). Both are common after LED retrofits. See common lighting failures. Readings taken with a phone app or an uncalibrated meter are not evidence for an insurer, HSE inspector or licensing officer. A formal lux survey report uses a calibrated meter on a defined measurement grid.