Lucas formula Dwc yield

If someone give you an answer with a number then this person is lying. You can’t know , each setups are different and each grower are doing their own mistakes so the yield is harmed by these 2 things. Let’s say 0.3 to 0.6 gram per watts for hps light , between 0,5 and 1 for cheap leds and 0.8 to 2 gram per watts with good QB lights and some skills

Its impossible to know without any info. You could pull 1kg easily from one plant with lucas if you just veg long enough. Lucas formula is decent and I've seen 150g from one plant with led lights and that was in a small tent so it all depends on everything. Have you checked and adjusted the pH properly and do you have enough oxygen in the dwc? Is the plant happy overall? If yes to everything then you should produce decent yield. Also 4th week of flower is still pretty early on and the buds aint even fattening yet that much.