I use one TSL-2000 in my 2x4. I would go either 2 SP-250's or 2 TSL-2000's. The TS-3000 would also be perfect for it. I keep the drivers in all my tents and heat isn't a problem at all. You can also like you said, put the driver outside of the tent if you wanted. I have cheap tents and they are doing awesome without any problems.4' x 4' veg tent.
How does the Heat compare to a 1000w HPS or MH.
With driver out of the room?
Will my tent be able to hold the weight of this light?
In your experience have any tents buckled or any other issues with the weight ?
If not what do u recommend?