Yes I'm sure. The pots are very watered and my can its almost empty
So the only thing you can tell that's gone wrong.......is the lights were out for a week?
And I also get the language difference.... you're in Bulgaria! That's wild, and is that your pet owl?? ;)
Looking at your other recent threads, and pictures, and looking at the entire situation, it seems like the problem isn't with your light cycle or the light timer thing, but with your soil (you mentioned using "old soil"), the pictures of your soil, the root balls.......they look all dried out, and things look "burned"......I can't tell if it's lack of watering, poorly watering/not watering thoroughly, causing big dry patches........or maybe it's too much nutrients buildup, toxicity......or maybe the Ph is way off, and maybe it's some combination or where one problem leads to another.....
We'd have to look at what you're doing, your day to day, week to week process to see what your doing (or not doing). But the next time you grow, I would throw out all of the old soil, and start again with new, fluffy, rich, dark soil, you can add a little peat moss, I would also add a little perlite, some worm castings..........try to hold off on chemical fertilizers and introduce them later on as they're needed. But good fluffy soil, watered thoroughly but it should be spongey wet, not soaking wet. And before watering again the top few inches should be rather dry, but the soil shouldn't be dusty, crumbly bone dry.
Check your soil and water Ph too
Maybe for your next grow you can do a journal here and post as you're growing?