Since my humidity was still to high i bought a dehumifier to fix this problem and it works really well.
But now we have come to the next problem...
The stretch was way more than expected and the plants are way to close to the lamp.
I've changed my original hanging clips for 4 ty-wraps to come closer to the roof and i managed to get it to 30 cm (highest possible)
I hope that the plants still can enjoy the bright light even when it's this close.
Not an expert but from knowledge gathered here tells me the big diff between your day and night temp are what might be causing the stretch!
Otherwise she looks healthy and happy. Happy growing!