Thanks guys, exactly the advice I was looking for and you thankfully refrained from saying inane irrelevant stuff like '10 400watt HIDS and 30 white widows is the only commercially viable option.'
I accidentally (its complicated) ended up with Arjan's Haze no1, unfortunately a very tall strain.I shall LST and top the shoots.A very short veg should help.I have germed it now and am waiting for the first leaves.
Thanks!