The suns just different than bulbs, bulbs are just trying to mimic the sun, the sun is millions of miles away, so a light is trying to be a mini sun a few feet away from the plants. It's just not the same comparison, if you'd like you can do a side by side, but I bet that unless you flower 200 tiny clones in a party cup with no veg, it just won't work. Now see, we are talking about in a grow tent. If you do not use a grow tent, then yes you could use 2000w.what I'm saying is in a grow tent you can't, unless you just grow in the frameof the tent wwith out the ceiling or walls.