critical questions

Okay I've asked on one thread, no help came. Probably because of the small traffic.
So here it goes-
I want to grow stealth but idk how wide the plant gets (easy ryder) [lowryder #2 X ak47] My grow box will be 21" width 27" length and 3'5" in height. Will this be able to sustain a high yielding easyryder?
Oh and could i use cfl lights and a 75 watt grow light (6500Kelvin) ?

I gotta say high yielding and cfl doesn't sounds like it goes together IMO . My suggestion is train the plant during veg..make it fill the space you want.