Red stem trouble

ok. your using 12 12 light ? and what kind of light ? hps ? also when the lights are out the room is total dark ? when I say dark I mean pitch fucking dark when you cant see you hand in front of your face, those should start flowering in 2 weeks or less, with the conditions above, purple stems or red. usually ph is high, also those are on a timer,
 
Thanks for replying,Have them in a grow tent under 200 w Fluo .Only have the lights on a timer fan I plug in myself,looked at them last night and their was a few small brown hairs is this a good sign?cheers
 
It has to be in the dark, I mean completely dark, for 12 hours a day. Keep in mind heat buildup and humidity issues.
 
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