Leaves turned olive green/purple. Any thoughts?

In recent weeks my leaves have turned from a healthy green to an olive green with purple blotches.

We have high humidity.
Nutrients have been sparingly applied. Fox farm. Soil.
Its been cold 50's F in box.
Went from CFLS to 150hps a few days ago.
I dont have a ph kit.

I know the conditions are not ideal right now but they have been consistant and only recently have we had this problem. My hope is that they have morphed into some kind of extra potent super weed but I am an optimist . Any opinions would be appreciated.

Its from the cold temps.

yeh i would go with the cold some times turns the buds purple aswell mate iv had that alot with outdoor near the end when the cold sets in looks ace when it goes purple i think ha but yeh

Thanks guys. I know the cold will lighten my yield but will 40- 50 degree temps kill the plants eventually? I am only five weeks into flower and it's gonna be cold the whole time.
Thanks again.

Yes its temp def ..... what kind of light do u use? Do u have any warmer production here ?

NSG said:

Thanks guys. I know the cold will lighten my yield but will 40- 50 degree temps kill the plants eventually? I am only five weeks into flower and it's gonna be cold the whole time.
Thanks again.

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using a 150w hps not the strongest light ever mate but will do it should not kill the plants i have had colder mate outdoors and all is fine but just keep an eye on them and you should be fine bro keep me updated and ill try my best to help