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How to lower humidity ( have dehumidifier )

Hi every1,
I hope some nice people on this forum will help and I will appreciate it very much.

set up : Have a basement of about 9 sq meters ( bout 100 sq feet ) and 2 meters high. Intake air is from 6" pipe with no fan. Extraction is via 6" pipe with an exhaust fan ( just a very weak one 75m/hour ).
Have dehumidifier running 24/7 with humidity staying at about 55-65%.
Now I'm well into flowering ( 6 weeks ) and want to bring it down to 40%.

some additional info : Air outside has 55-60% during the day and about 80% at night. Light are on at night due to cheaper electricity.

What can I do to lower the humidity? What options do I got here?

Im thinking putting a proper 300m/hour exhaust fan ( plant transpiration ). but fresh air coming in is humid, so obviously something has to be done about that.
 
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