I dunno whats up with the pink..never heard of a pink strain, it actually looks like someone just colored it in with a highlighter in that pic...lol...but it may have something to do with the nutes or the lack of nutes..
The stems arent supposed to be that purple-ish red color either, your plant may be lacking phosphorus (the 'P' in n-P-k) what type of ferts are you using on them? and how often do you feed them?
they look like they're surviving, but they could be a lot better..and it has nothing to do with the lights..
whats ur humidity and whats the temp with the lights and fan off? what are you doing for co2? in an area that small without ventilation you definitely need co2, it could also fatten up those buds and increase your yeild by 30%-100%..get back to me on those ?'s please..
oh yea, and how well is it light-proof'd?