@skudra Welcome to AFN
I am from the school that does not believe in defoliating. Each leaf that the plant grows costs it energy to make it and each leaf is a little factory to make energy for the plant. Often growers defoliate just to have the plant spend a lot of energy to grow the leaves they want back. You will often hear growers say a few days latter "The plant looks like I didn't even defoliate". Well that is because the plant grew some more leaf
Now that said there are times when some defoliating is beneficial to getting a good harvest. Airflow in the lowest part of the plant will help to prevent Bud Rot especially in plants with big tight buds. (I try to grow plants with more open buds and not worry about bud rot). Your plant looks to have some fairly tight buds at this stage so I recommend taking only some lower leaves to keep good air flow.
The idea that buds need light to grow is miss-understood and comes from photoperiod plant growing. Once a bud has been initiated from the node it will grow without much direct light as long as the plant has enough energy to send to it. In growing photoperiods that allow a lot of time to train and shape the plant, exposing the nodes to light will encourage a bud at that site. Autoflowering plants do not afford the time needed to train and expose the nodes instead a one time topping above the fourth node will give you the best yield.
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