Another harvest and weight GUESS!

Hi Everyone, my brother has a nice project on the go at present, he has 9 x Big Bangs & 9 x Big Buddha Cheese all are over 1.3ft tall and are quite bush, All in all they have been in Vegg for nearly 5 weeks and are having growth sperts every few days or so.

Well here is the Question we have been bickering as my so called brother thinks he will end up with 40oz dry weight from all plants in total, he has 1 x 400w HPS and 1 x 400w MH & 125w Red and Blue Spec CFL, He is also giving same nutes as me the Canna Veg , Terra, Boost & PK/13.14

I have my thoughts but what are yours.

Pls RIU end this stupid ranting of his

Its possible...i have not been growing long and usually get about 2oz per plant so if i got 40oz of 18 plants i would be buzzing but i use 600 watt HPS. I always plan for an oz a plant and anything over is a bonus.
Good luck

No yeah i always hav in ming a ammount and what ever i get past that is a bonus