I do not know aeroponic. I think if you want to achieve maximum yield you will want to veg as large as the capacity of your rooting vessel and the height is somewhat dictated by the lighting systems penetration power. In soil, 400 watt fixtures I veg eight weeks from seed pop. I top just about all the different strains very early in seedling and if needed, again up to the point when the plant shows sex. I like to have the plant at 50 cm tall or a little taller for a quick finishing indica. If you have a 1 meter tall flowering female that would be a good height for the 300 watt lamp to have power to radiate energy from the canopy top to the bottom buds of the plant. I trim all the 'hair off the ladie's legs'. That is, I keep the green growth trimmed off the bottom third of the plant. Acapulco Gold was my favorite herb around 1974-75. That's the only time it was around. Good growing, Espana28