Not true, just gotta veg for more than 10 weeks, and if the genetics are good yielders, the grower will take a pound from hydro every time. In fact, when I was using HID, I never got less than a pound until OG Kush. I'm using a little more than 400 watts of COBs now and just took a few grams light of 20 ounces from Triple Cheese, and when reading the descriptions of TC vs PC on Barneys or Herbies, the PC suggests bigger yields. Also, the finish times are the same small to big plants I would think. I can attest that big plants generally finish roughly as advertised. I'd bet even in soil, if you coax the roots to grow quick and fill out the pot, you'd only need to veg for 10-12 weeks to pull off a pound, but that's just a guess as I've never grown a female in dirt.