Never changed the daylight cycle, always 18/6.
The flowers have a really nice smell, the taste when dried (a small sample dried before cutting) is intense with a long lasting high effect. Little paranoia at first then a full dream like experience!
If those leaves are not in the light they will do that and it's normal. So to help the plant out pluck the yellowing leaves off, or you could lollipop the plant and anything not in the light will die or will not form buds properly. Just my 2 cents
Ola bro. Estás com uma auto muito boa, parabéns 🎉
Em relação as folhas amarelas, usa um pouco de grow que deve resolver o problema. Também tive assim a uns tempos e ainda tenho umas plantas a recuperar. Mas nessa fase é normal, nada que tenhas que te preocupar :) já agora és português ?
Abraço