2 to 3 ounces for a 2 to 3 foot plant is normal. No one is getting a pund of an indoor plant. Be careful of a lot of the supposed experts out there. Haven't used led's yet but have used T5's and they work almost as good as hps.
There is some misinformation out there about led's and its manily to do with heat. They still generate a lot of heat so be sure and have good ventilation. Good Luck