Absolutely love my Gavitas. I would recommend them all day long
I would like to think I could pull 2.5+ per light with Chinese ballasts and hortilux bulbs but I doubt that's the case.
I don't know why you don't think you can pull 2.5 a light with a Hortilux and a Lumatek cause you can with the right strain and techniques. I got 74 oz (4.625 pounds) with 2,000 watts and I no way dialed the canopy at all. I know I could have got much more if I SCROGed it. The buds flopped all over each other and there were many gaps even when the buds didn't flop. I know it's not 2.5+ per light but maybe you have a better strain now and are more dialed in with that light. I wish you had a full grow on the subject since these lights are so good.