Yes I guess it's just experience... I been doing this for a min or two but you know that, It's like 2nd nature to me...I'm never really off by much, I usually always go under what I actually think to play it safe but usually am dead on...Even other grows I have going on I already have a very good idea how much from each one and even threw that out there...
Not many people will say I'm going after a record on this grow before it even starts, then actually sets it... I always go on record like that, I always set my challenges high!
This won't be no record that is for sure, but I do have some that will be! The big thing to remember all my weight records I gotten using only 3gal pots & sub-par lighting, even my 1lb'er + ..It wouldn't be a challenge to me in a 5gal pot...Just imagine if I had top of the line lighting, this all been done with budget lighting...lmao