You can pull off a shitload if you know what your doing. My friend pulled 2oz off one plant(But the catch is one plant with lots of light). It doesn't matter about the type of light, its more about Color Temp. and Lumens. In some cases not even Lumens. 6500k color temp for Veg, and 2.5k for flowering. And If I remember right, its something like 4000k lumen minimum per plant.