Hi there, I'm sort of in the same boat - it's my first SLH grow and I've only recently been introduced to the strain. (Subscribe to my SLH grow journal at http://www.rollitup.org/members/jabbadagriffen-239188/albums/super-lemon-haze-grow-log-12210/) - there are a few other journals out there too by eightenough and laciegirl you should subscribe too, they are further into the grow than me too. 400W should be more than fine, maximise by using mylar sheeting in your closet space, (remembering floor and ceiling).By the looks of it this plant can grow out of control, but you can keep it in check by pinching the growing tops accordingly - I've heard this can grow up to 3X high in flowering phase, so if your worried about height you can tie down the branches also. eightenough has been 'fimming' his plant, essentially this means frequent pinching out of (only) the very top shoot on the branches as it appears - this makes a shrubby more indica-style veg which looks pretty effective.
