Help! Dark patches

Hey guys! still on my first grow running into some trouble ive recently had 1 ak47 die of this same problem that has started to effect my superskunk i've searched around on the traditional plant probs and other peoples probs and none seem to match mine. basically there getting weird dark patches that when i rub the leafy dark patch it smells funny, also the infected leaf goes crispy and hard and twisty i'll quit the explaining of the prob and just post some pics, but first some info!

im temporarily growing in a compact open from growroom, with 600W HPS, dehumidifier, and 2 speed medium sized fan, i've used no nutes at all yet, so onto pics!

1st pic: that bottom leaf you can just make it out slightly tinted yellow with dark patches

2nd pic this one here the leaf end went crispy and when i squeezed it it broke off

3rd pic : again, you can just make out which leaf is infected

4th pic: finally the whole grow room

hope you an help me diagnose and remedy this problem ASAP

many many thanks!
 

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