It seems all my stems are purple and nearly all the leaves feel extremely dry and others look bleached. I dunno what is going on here....

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anyone?

It's in the 9th week of flowering, and has 2 150W HPS lamps on it and 2 42W CFLs. Grown from bag seed.

Without knowing all the details, I would guess one of the following:
1) improper pH causing nute deficiency
2) over feeding (nute burn) <- I am going with this one for now
3) Using HID lights after foliar feeding causing burn spots

I am going with the nute burn cause if you look at this page:
Marijuana Plant Abuse

You could replace their example of nute burn with one of your pictures.

That's what I thought at first [nut burn]. One of my friends was the culprit for these problems as he didn't follow my directions AT ALL. Anyhow, I immediately flushed the plant and for about 1.5 weeks and it didn't get better. In fact, newer leaves that were fine after the initial problem began to have problems.

Then i'd go down the checklist:
1) Temps
2) PPM
3) pH
4) lights

is this hydro or soil - i am hydro grower so all my solutions are going to be based on fast turn around time for results.

It's soil. The temperature is fine during the day (HPS lamps providing warmth) but at night it probably gets to around 60ºF, probably causing the purple leaves.
I made a new solution of nutrients to see if maybe if one of them got locked out. I'll see what happens tomorrow.

i hope it works out for you!