hey man....they look great, no doubt.
but just to let you know.....from my expierence i- i would have grown out two, three, or even 4 smaller plants.....vegged for 4 weeks and not only would have yeilded more but you would have been done and curing / smoking right now.
i veg some seedlings for one-two weeks for an sog and they all yeild 1-2 oz.s. i say flower for a shorter period of time and have more- bushes....you will use the lumens that the light is giving more efficently by having more even budsites rather than one plant with some tall budsites getting all the light and others well below the canopy line......
remember, intensity drops drasticly the further away you get from the bulb....inches mean ALOT here.
just thought you might like to know how to get yer yeild up after you see how much you get from that one lanker.
she looks great no less dood, not knocking you by ANY means...
by like rocky said, some yellowing of lower/older fan leaves is totally normal. if you start feeding with water in another week she will really start to changes colors....using all those stored nutes for bigger, better tasting buds compared to feeding up until the time you harvest.