No mate leds are nowhere near as good as any kind of hid.
Used on their own they will produce only light fluffy little buds comparable to using a couple of cfls.
I would not recommend using these on their own unless you plan to buy a lot of them,like say 2 panels and 2 lamps per plant.
Thinking that you can just put 1 of these lamps in a cupboard would be foolish,you need many of them to pull of a good grow and if you do i would recommend supplementing them with a couple of fluorescent tubes in the same room.
Ive seen a couple of led grows and the buds are always small and fluffy.
Having said that i have never seen a grow that used many led panels which may be a better bet.
I still believe that for flowering hps is the best but as a side lighting for the lower buds leds are great.
They are also great for bringing on new seedlings and clones and keeping mother plants alive,whilst costing very little in electric