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So I started some Master Kush, vegged fine they all were nice and squat. Moved to flowering under a 600watt air cooled HPS system, kept the light close enough. But these babies keep growing taller. In my 5th week of flowering and every other day I have to raise the light as the babies actually touch the glass on the light. I thought Master Kush was a squaty plant?, maybe I don't have enough light? Any advice is appreciated.

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There is always a stretch the first couple weeks of flowering. Yours do look pretty stretched, you do have enough light. Did you use the HPS for vegging? HPS for vegging will make longer length between the nodes.
You said 5th week flowering, is this the 5th week you've had the light on 12/12?

I vegged with fluorecent's. Today is the start of week 5, so day 29 of flowering. 12/12

29 days would be 4 weeks of flowering. I had the same problem with master kush on a 1000watt hps and 4 foot T5's for veg. It maybe the pheno or something. Didn't yield well either and I was using the same nutes and same concentrations I use on everything else. Could be the strain or the pheno. Not sure if anyone else has had the same problem though to really compare but I was stumped as to why it did it with me too.

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hi erb i got 8 master kush growin in a wilma 8 from seed under a 600 this is there 3rd wk ov flower i just changed nutes to flores(canna) 3 are 3ft 3 are about 2.8 and others about 2ft, 4 are bushy and 4 look like they av streched but when i measured the internode spacing there were all the same so could be two phenotypes i keep ya posted on them but starting to get some nice hairy bits on them you can see the bud starting to thicken cheers GP.