The number of lux depends on the distance from the lamp.
At a distance of 10 cm (very close), this is as follows:
The further away you sit from the lamp, the less light intensity.
So on setting 1 or 2 it is under 2500 lux but at a distance of 10cm, that is very close.
We have now also done a measurement on setting 5 and measured the distance to where it drops below 2500 lux, which is from 25 cm. Probably more pragmatic, so on setting 5 from 25 cm you are under the 2500 Lux.