Need some Q's answered? any help?

Hello,
ONE--I recently crossed a purple strain with a local trainwreck.. hint my name...
It's mostly sativa (I think) and can I grow this indoor?
Is sativa really that bad to grow indoor?

I was going to cut some clones.... and I just got some seeds started today... so I'm a ways away but will gladly post pics if anyone cares...

This will be my second time growing indoor and any feedback would be great....

Second,
this duche at the local store was convinced that the max yield for a 600w hps is 1 to 2 pounds tops.. So I'm on a mission to prove him wrong...
the rules... no soil can be used.. that's about it...

My first grow yielded a 1/4 pound (a bit over)out of 3 plants under a 250w hps... there is a pic that I posted of a small nug under bud pics....
I think that I could get 3 to 4 pounds out of a 600w hps.... Or am I just dreaming... but this is a ways away due to funding problems....?

on that note...My new mission is to get close to one pound out of this 250w hps...
with my created strain....?...
it's a mix of a local trainwreck looking plant with a dark purple strain.... both are not nor were in a while bought from any store.... I grew both plants outside far away from eathother and had great sucess - and figured hey let's mix them together and try it indoor?..
I figure and this is why I'm really trying this is...
the purple was a small fat bushy plant with fat and short leaves.. biggest plant was about four to five feet tall... good yield... great high....
the other local trainwreck was pretty tall and super hairry nugs... I kept one male and secluded him far away.... then polinated a portion of the female and got about 40 or so seeds... I think I kinda f-up because seeds were not that dark and most were light color... but got about 10 or so dark ones that look good...

Any feedback would be great,,, thanks for reading........B.

3 lbs from a 1 600 watt light is gonna be a feat to do especially without soil grow as an option.Weird you got a male trainwreck plant since its only availiable as a female clone except in the next few montrhs green house seed company has forced male seeds.Being white widow and trainwreck it should have a heavy indica background since the trainwreck is an indica heavy origin and the white widow is 40% or higher indica and I guess the factor of what type purple you got would be the difference factor.Would be interesting to see.;The widow should add the yield since trainwreck doesnt heavy yield and neither do most purple strains.I use 2 600 watt digital lights on a light mover for 28 plants with co2 injection in an aero setup.I can yield about 120 oz or so before dry which comes down to about around 3 lbs or so with pure indicas.I use overclocked digi ballasts so actual output is closer to 650 per setup with spectrum enhanced bulbs co2 levels at around 1300-1500 ppm

120 oz 48 dry oz ?? How are you accomplishing this? That is very interesting to me. VV