Flowering period

It's hard to tell in those pics, but dude you seriously need more light. You can't do a grow like that with a few while leds and some flouro strips. Looks like you need a few HID lights and quick!

My guess is that you don't have the room sealed off well enough, and aren't getting a real 12 hour fully dark period. Just guessing.

That's a lot of plant for such a lighting setup. I don't mean that complimentary, you gotta up yiur lighting and add a fan. If you were to add a hid now for example, those stems wont support very much. Keep learning and keep growing, good luck

There is a fan, it's just not on the pictures. during the lights on period, the window is also opened, which adds quite some light too, as it is 2 by 1 meter large. Lighting is limited, as it is soon visible in electricity, and police in our country have a habit of visiting houses with sudden bump in elecricity ussage. The grow is not set for maximum yield, it's the first one, and is mostly done for learning. So, in third week the buds started showing, now i wonder, can the clones still be taken and put on 18/6 lights?