5 litre sounds a little small, as other have said, don't use anything smaller than 3 gallons. I've used 3 gallon, 5 gallon, & 7 gallon smart pots, all for autos, and regularly get 2-4 oz. yield per plant, and that's from an old school 400w Tech lite. (2 oz. AKR, 4 oz. Northern Lights) It's not...