Leaves problems

I'll try, thanks ! (Also, my lamp is now at 80cm )

If it's helping : my lamp's seller said "40cm = max660 umol/m²/s" and "60cm = max430 umol/m²/s"

Thx for answering guys. The "thing" is spreading fast, new spots (new photo, but idk how to share it) but affect only one of my 4 little babies. The lamp is approx 50cm away, do you think it's too close ? I'll pay more attention on the watering Also one of my top leaves is like light brown dead in the center of the leave

Für mich sieht das aus als wäre das Licht Stress Lampe zu nahe?

I'm wondering if you don't have a problem with some pest ... (perhaps fungus gnats? If out of control, they can cause damage to the leaves like this). If the problem is fungus gnats, you'll see them flying around... they live in soil that is damp all the time and can wreak havoc with your grow. I've found Mosquito Bits to be a WONDERFUL cure for the problem. It sounds to me like you are watering FAR too much... Let the plant dry out completely before watering! You can usually tell just by picking up the pot if she needs water or not... The only other thing I can think of is a calcium deficiency... this will cause brown spots so you might want to try some CalMag ... the brown spots will always STAY brown spots but if it IS a calcium deficiency, you won't see additional spots cropping up. Good luck, mate!

The "lonely dot" seem to expend to top leaves : One hour ago it was clean, now the top leave has a little dot !!

Yes ofc ! My strain is Colombian jack fem from Kannabia. It's indoor with Niello 1000w LED 18hr/day (doubt the 1000w). Random soil from local store (80% peat 20% coco) in 18L pot. HR around 40%, temp is around 25°C with light, and 20 the night I'm watering around 1L on Monday and Friday (for 18L of soil.... But If I do more, it stay wet for years... I air severall time a day, and I have a fan working 15min every hours) On Monday I also add biobizz bio-grow since week 2 : 2ml/L of water (So.... 2ml lol) I topped it week 4-5. Two weeks ago I cut some bottom leaves (week 7 and 8). Last week I flushed the soil with a lot of water outside and let it dry a bit for "cleaning the soil" before going to flo with new nutriments, just to be sure there is not to much. Thanks again !

Since you have no diary, you need to provide a lot more information. Strain/auto/photo/lighting schedule/nutrients/substrate/indoor/outdoor???etc When it comes to watering, do not water "just because", water only once the top inch or so has dried out from the previous watering.