Anybody grow Nirvanas Norther Lights?

I have 16 of Nirvanas Northern Lights in my grow room, currently not showing sex just yet. All are around 4 weeks old and around 8 inches tall. My questions are for anybody who has had experience with this particular strain. I am growing in soil under cfls, and will be putting them in flower under 400 watt hps when they are ready.

(1) How much stretch in flower can one expect?
(2) Is it better to top/fimm this strain or do you get better yeilds by leaving them uncut?
(3) Any other info that would be useful in growing Northern Lights, such as fert tolorance, mold resistance etc. would be nice.
(4) ease of cloning, I know that some strains are harder to clone than others, how does this one rate?

I have an 8 ft. x 8ft. flower room with (6) 400 watt lamps. Height limitation of 6 ft. ( Lamp height) I don't want them getting much bigger than 3 ft. I'm not sure yet weather to do a sea of green style grow or go for larger plants, it all kind of depends on what kind of feedback I get from people who have grown this strain befor.

Thanks in advance for any input you can give me.

My last grow was Nirvana Northern Lights. I use soil in a small speaker box with 210w of CFLs. I'll try to answer your questions from my experience:

(1) mine stretched only 10-12 cm but I flowered with CFLs so I have no idea what to expect with HPS.
(2) it responds very well to topping if you want them to grow bushy for a nice scrog.
(3) this strain is very easy to grow.. mine was healthy the entire grow. I harvested at 8.5 weeks of 12/12.
(4) very easy to clone. I'm using the primitive way of cutting a branch and sticking it in a glass of water until it roots. so far I've had 100% success with this strain.

you can check out the thread in my signature to see the entire NL grow.

good luck!

Thanks, if they only roughly double in size I'll let mine go to around 18 to 24 inches. Thats what I was looking for.