70 watt hps for 2 lights.... thats harsh man. You should atleast have gone to walmart or something and picked up some cheap CFL's to hang around, would have given you a much bigger yeild. It was deffently the light that effected the yeild, not the strain.
Either way you still have some fresh homegrown kush = ), nexttime though, go to walmart and pick up some Compact Flourescents Lights, they are very cheap, and dont use much energy at all.
That is a pretty nice looking bagseed plant fifty, I think it will be done before christmas for sure, but im glad that you are willing to wait longer if you have to. Becuase cutting early is the worst thing you could do.
Keep us updated = )
Goodluck growers <3