Clara HD How to decrease the lowest brightness level ?

Please guys can you help me, how i can mod my e reader to get lower brightness ? Reading at level 1 is way to bright for me in the night, i cant fall asleep reading before bed.

What i tried:
I checked the Kobo eReader.conf and tried decimal places for:
FrontLightLevel=1 (but according wiki only integer are allowed)

I checked the KoboReader.sqlite file, nothing is related to brightness.

I couldnt open BookReader.sqlite (does not seem to be a database).

I have checked all release notes of older versions, brightness was never mentioned. So i might wont have luck trying to do a downgrade to an older version ?

I could try open the ereader and glue something over the leds to decrease strength...

Can anyone help me out before i demolish my fine old reader ? =)