We use a 4' x 4 bulb t5 set up for veg and could not be happier! How much area are you trying to cover with it and are you vegging or flowering with it?
Should work great for 2 plants. Just keep the light as close as possible and you might wanna try some LST on the ladies for deeper light penetration. We have never personally used the t5's for flower, but have seen many growers(with the proper light spectrum) grow some dank budz!
low stress training. you basickly use string or whatever to sread out your main branches before/after topping. technique provides more light to a bigger portoin of the plant without upgrading lights.
I had T5 2' four bulb setup for awhile for my veg only. I've had up to six plants under that veg light and was very successful. I use 2 400w HPS lights for flower. I now have a T5 2' x 8 bulb setup for veg.