I have a light leaves on youngest ones. Any idea, ...

Nada de que preocuparse, te recomiendo medir TDS de la solución de riego y aplicar cal/mag, las hojas tardaran un poco en recuperar el verde. Es importante medir TDS para no sobrealimentar. Buenos humos! 👌

Well, not much nitrogen in those leaves at the time of the picture. Light spots on leaves are usually the first signs of a calcium deficiency. Give your plant a little more nutrients and see if that helps. It may just be a heavy eater and need more nutes than the other phenos of this cultivar. I hope this helps.

Hi there! In my opinion you should watch out for Ca/Mg deficiency. Just make sure the water is not too soft. In case it is, some CalMag foliar feeding could help. Then add it into feeding solution.

It could be very early signs of mg deficiency and possibly N too, but after looking at your diary and feeding, it shouldn't be that. At sunrise/lights on a lot of the new growth can be lighter, it hasn't been exposed to light, but by the end of the day it should have darkened a bit. Yours is a bit spotty and is what is leading me to think it is early signs of a problem.

Hi there It looks completely fine to me new growth is always lighter colour until it matures.. Best of luck 🌱