Devolo window / door sensor mt02648: Illumination unit?

I cannot find an info, which units are used here. Is it Lux or is it percentage or something else? If it is percentage, the meaning of 0% is fully dark, but what is 100%?

I do not have this device but maybe this link will help.

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I did read that document multiple times and cannot find any info about units in it :frowning: