ive heard of some sick number like 64-81 1 gal milk jugs....cropping like 3 lbs with a 1000w hps in a 4 x 4 tent with a sun soaker hood! if you can find it on IC....i think the grower is jrosek....ive read a thread from him called 3lbs for dummies using hempy 1 gal milk jugs!