Your Grandpa's Weed or is UV supplementation really needed?

Discussion in 'Advanced Marijuana Cultivation' started by RM3, Sep 5, 2016.

  1.  
    mr. childs

    mr. childs Well-Known Member

    i use the 2ft agro bulbs. respect them for what they are, theyll bite you...
     
  2.  
    mr. childs

    mr. childs Well-Known Member

    it happens pretty fast when placed in close proximity. i always wanted the uv200's as i used the 150's years ago. just place them a little further away. i left mine on for the full duration though...
     
    davillains likes this.
  3.  
    Chunky Stool

    Chunky Stool Well-Known Member

    Gotta keep those bulbs at least 12" from your plants. I run five of them in my tent, but make sure plants never get too close.
    I have found that "sunburned" leaves are more susceptible to PM.
     
  4.  
    davillains

    davillains Well-Known Member

    Chunky I suspected as much, I had the bulb 19" from canopy ...
    Do you run your UVBs constantly or on a timer ?
     
    jacrispy likes this.
  5.  
    Dr. Who

    Dr. Who Well-Known Member

    Well, I found a 12 pack of my old 400w Merc vapors.....18-20 inch's (min) away and 2-3 hr on time during the "peak" hrs..... or 15 min an hr - bookended by no on times to total 8 times.....I don't like that for the ware stress from spiking on all the time...

    But still, I understand the respect them thing, for the Agro 2 footers...Are they still 36 inch's away by limit?
     
    mr. childs likes this.
  6.  
    Chunky Stool

    Chunky Stool Well-Known Member

    Hmm... 19" should have been enough. Maybe your plants need time to adjust. My plants are always exposed to UV, so they get used to it. I frequently leave the tent open, so even my dome of seedlings & cuttings get a tiny dose of UV. They dig it.
    I'm running bare bulb MH right now, so lizard lights are switched off. Two weeks after the flip, I'll switch to HPS and leave the lizard lights on the entire time HID lights are on.
     
    Bbcchance, jacrispy and mr. childs like this.
  7.  
    mr. childs

    mr. childs Well-Known Member

    i had mine 12 inches away like i used to keep the cfls, fried some tops, 75% uvb + 25%uva = no joke but well worth it..
     
    Dr. Who likes this.
  8.  
    Dr. Who

    Dr. Who Well-Known Member

    How long are your "on" times?
    First thing?
    Mid lighting time?
    End of lighting time?

    I mean, i have to prepare to change over sometime. might as well find whats working for others with out toasting plants to learn.

    I suppose i should buckle down and read all the 38 other pages (head spins) lol.
     
    Roobarb, ttystikk, Bbcchance and 3 others like this.
  9.  
    mr. childs

    mr. childs Well-Known Member

    i always run uvb from day one of 12/12, i need to run it day 1 of 24/0
    just take heed of the distance... gradually getting closer is the way to go, hindsight is 20-20, sometimes even 20-10 like a fighter pilots vision...
     
    ttystikk, Tyleb173rd and jacrispy like this.
  10.  
    Tyleb173rd

    Tyleb173rd Well-Known Member

    All the info seems confusing. Plus, there are so many others that talk about UV but don't use it. So far I've seen one or two growers that have showed their UV lights and the bud that it grows.

    I said fuck it and added UV to 75% of my VEG tent and 25% of my flower. Slowly over time I'll increase the bursts of UV and I'll eventually start giving UV from the moment they root.

    We have the room and space to fuck around with lighting so we take advantage of it. In a year I should have some decent data and hopefully better meds.
     
  11.  
    jeepster1993

    jeepster1993 Well-Known Member

    The temps got a little low for a week and had a negative effect on my babies.They slowed down, a lot.
    Have since made corrections, but it happened.
    The corrections were to mostly stop venting the tent and let it keep its own heat and that has worked.(there is some smell leaking out though)

    This is today, almost 5 weeks into 12/12...
    Like I said, a bit behind.
    [​IMG]
     
  12.  
    Dr. Who

    Dr. Who Well-Known Member

    Yeah I hear that too.

    I got 2 6 packs of my old school Merc vapors coming. Those will last me awhile....By the time I use those up. I can get some intel from youse and Riddle and ttystikk ......I waddle through my old way for now....THANKS!
     
  13.  
    ttystikk

    ttystikk Well-Known Member

    I want to hear about how things go with the MV; this was a strong contender in my project until I saw the Agromax Pure UV.
     
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  14.  
    Tyleb173rd

    Tyleb173rd Well-Known Member

    The difference between the Agromax and the new Hortilux FS-UV is night and day. I bought 2ft Hortilux for the young girls and the Agromax is for the more mature teens.
     
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  15.  
    mr. childs

    mr. childs Well-Known Member

    can you believe that the old agromax bulb was 100% uvb & thats it! htg stopped making them years ago, along with realizing that uva is also beneficial
     
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  16.  
    tstick

    tstick Well-Known Member

    I just recently came across the realization that my old 400 watt MH bulb/fixture/ballast combo is a real UV emitter! I'm using my Timber CXB 400R, but I don't think it puts out much UV light.....SOOOOoooo I think I'm going to switch out the COB for the MH for the last week of flower to try and enhance/ripen that last bit of "stuff" in the plant with that excessive UV. I've heard that finishing the plants with MH light is a fairly common practice, actually....I've got the stuff...brand new bulb....What the heck?....right?

    Also, the price on the 400 watt bulbs has gone waaaaay down since back in the 80s when I first started using them! I got one for around $20...on Amazon no less! Too easy to not give it a shot! :)
     
  17.  
    Dr. Who

    Dr. Who Well-Known Member

    Well, you saw some years back my older work with it.
    I was doing rather close to plants and around (notes not in front of me) 10min an hr every Hr of lights on (I never liked the "on-off" spiking all day - hard on bulbs and ballast's). I have settled into a very close to RM3's style of "on" 3-4 hrs at outdoor "peak" lighting times at further away. Like 24+". They have been running between the 1K's and I was turning the plants every day 1/4 turn. That got to be a pain, and sense the "raid". I have been building a flid up support that brings the bulb horizontal under the 1K hoods. I simply flip them up, let the "brace" out to hold them up and leave it there, with the MV on it's own timer. No shading loss from the MV is of any particular effective lighting loss when the MV is off. Now when you have as many as 8 of these running per room. You don't tend to want to go in there at that time period!


    I tried that and found that the glass in reflectors. Block too much of the UV.....but, if run longer then those last 2 weeks. It does do acceptably. That is whats given rise to the "Dual arc" bulbs out in the last cpl of years.
    You get 2 things from those! A more "positive" finish with the full bloom period getting usable UV. That whole bloom exposure makes up for the "late" bloom with things like the MV and the Agro.....yer higher UV output has a more profound effect (I'm thinking). I'm going to get a cpl of those "dual arc's" to confirm my theory at my next "comfortable" available time! I'm sure the deeper blue spectrum's are helping that more "positive" finish also!

    Anyway, that's where I'm at now, and if the dual's do well, maybe no need for any other supplemental UV.....THAT would save $! Even with my #'s cut in half for "compliance". Dropping 3200K off the E-bill would be nice! :hump: That will be later in the year....Just getting rolling good again, and building my rotation strains back up is still going on. Shit, I got 4 more strains to even start yet. Gotta work that rotation in right!
     
  18.  
    Dr. Who

    Dr. Who Well-Known Member

    Oh yeah, I forgot to mention that any plastics like polycarbonates are worn out and yellowed up badly by UV, and the MV/Agro power's will do it quickly! Store any plastic away from the bloom area when using UV!
     
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  19.  
    Chunky Stool

    Chunky Stool Well-Known Member

    You've also gotta run MH bare bulb to get the UV.
    When I spend a lot of time in my grow area, I actually get a tan from the UV!
    Always wear your shades kiddies. :cool:
     
    mr. childs likes this.
  20.  
    tstick

    tstick Well-Known Member

    Yeah my reflector is an old one that doesn't have any glass in it so I should be good to go.
     
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