in my experience, building 250watts 5 spots fixture (5x50w) cost me ... I can't remember now, but well well over $800 canadian, I had to put it together, top of the line components though... great. now I just wanted a quick cheap plug and play, and to be honest, I can't see the difference between cheap (vero) COBs and expensive (CREE) COBs. As stated in previous post, for the most part, what you put in you get out, wattage-wise. If I was looking to buy a main lighting fixture I would look into greengenes new fixtures or some other companies, but I have all the main fixtures I can afford to run ( or have the space to ) I was just curious to hear other people's opinion on those and why not more people using them.... at 4000k, are they not meant to grow dank!?