Nice, I assume the HPS light is why the stretch occurred then though correct? Pretty sure (unless it was intentional to stretch) if you add a couple blue ((bright white um like 6500k)( or possibly even blue party bulb CFLs? )(experiment ive been wanting to try myself))) lights during the first couple weeks of starting flowering it really cuts back on it stretching up and your plant will focus more on trichome and bud formation.. Just info I've looked into and figured I would pass it on.