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Thread: HPS for lighting Autos???

  1. #11

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    My first auto grow was done 12/12. For security reasons. I didn't realise how much 12/12 would affect them. They took forever. I chopped after 16 weeks and they could have gone a few more weeks. They yielded well enough. The 3 autos weighed in at 297g and there was room for 4. 315w cmh.

    Next time, same strain, smaller pot, 2L Pepsi Challenge, was 24/0. 315w cmh vegging lamp. Was a bit further on than the 1st grow when I chopped at 12 weeks.

    If you want maximum yield psf per year, then 24/0. 12/12 for 16 weeks used less leccy. The sweet spot will be a balance between how long you can wait and how much leccy you want to use.

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  3. Default

    This thread is great. Very useful. I have been trying autos for the first time having previously only grown "normal" plants. Out of habit and probably ignorance I have been using the standard 18/6 for vegging but from the contributions here I can happily change this to 20/4 and improve my grow rate and possibly harvest.

    Thanks guys.

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  5. #13

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    I was pleasantly surprised with my 3 autos. I made some mistakes and got 1.5oz psf which equalled my best ever photo grow.

    2oz psf has been often achieved. Can just about get 4 harvests a year with autos. That gives my 7sft cupboard the potential to average an ounce a week. Unthinkable not so many years ago.

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  7. #14

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    I've always ran 18/6 with auto's never been a problem, only changed to 20/4 this grow to ease the rh


    "Patience is bitter, but its fruit is sweet."

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  9. #15

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    HPS is fine, relatively a nice and gentle light nowadays so as not to overdo DLI on autos

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  11. #16

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    Quote Originally Posted by Farmer Geddon View Post
    I was pleasantly surprised with my 3 autos. I made some mistakes and got 1.5oz psf which equalled my best ever photo grow.

    2oz psf has been often achieved. Can just about get 4 harvests a year with autos. That gives my 7sft cupboard the potential to average an ounce a week. Unthinkable not so many years ago.
    It's still "Unthinkable" for me today.

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  13. #17

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    Quote Originally Posted by Easy-T View Post
    I've always ran 18/6 with auto's never been a problem, only changed to 20/4 this grow to ease the rh
    ..."rh"... Relative Humidity? Now that's interesting.

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  15. #18

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    Quote Originally Posted by mpsj View Post
    ..."rh"... Relative Humidity? Now that's interesting.
    Higher temps equals lower RH.

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  17. #19

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    Quote Originally Posted by mpsj View Post
    It's still "Unthinkable" for me today.
    With modern auto's in coco and 3gallon fabric pots it's easy to achieve 5oz/plant these days,I managed 8.5oz from a gorilla glue auto last year and I've seen some other guys pull more.

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  19. #20

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    Quote Originally Posted by scoot View Post
    Used to use HPS for auto's all the time,I used to swear by 24/0 lighting for auto's but now I'm sure that 20/4 produces better taste.
    I only ever grow auto's and 20/4 seems to be the sweet spot for me. With 18/6 I definitely saw a lower yield in my plants but I haven't noticed much of a difference between 24/0 and 20/4

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