Seb
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Good point......I’ve done things like this on a limited basis in the past and no issues came from it but it’s a new room, new lights, new everything basically. The biggest leaves have to go, that’s a given. But as you can see, these have a classic indica appearance and although there’s not a ton of leaves, what’s there are large.
I also used to trim clones back regularly and they did just fine as I used to have a 100% Survivor rate when I bothered with them.
Notice they harden the plants off at the beggining of flower? Also did not see what intensity was tested... lettuce extremely bad example to compare with UVB.
Yeah me either... good point I may have missed it... but most studies showing an increase use UVB only at the end of the grow... another grower here @Moe.Red did the same as the video and came to the same conclusion... no increase. I think it's important to note this difference from the studies showing an increase. After all the science behind it is the stress it induces so if they are acclimated early in flower that would kinda put a damper on the purpose no?The hardening of the plants like that is something they recommend in all the documentation of there lighting regiment.
I have to admit I noticed they didn’t give details on intensity of uvb. I was in a hurry when I watched it so I didn’t stick around for the q and a portion so I don’t know if it was addressed there.
So, I'd recommend watching the first 20 minutes of the video but to sum it all up, their findings show:
1. UV-B reduces overall yield and does NOT effect resin and terpene concentrations (production).
2. Far Red is expensive to produce and adding more white light (instead of far red) is just about equal in results but cheaper. The main advantage to the far red is stem elongation, although it reduces branch quantity.
I think the UV-B findings kind of runs contrary to Bruce Bigsby's studies but the far red is similar. I'm wondering if I just wasted $200 on the UV-B lights.........LOL I'm also wondering if I can send Bruce the video and try to solicit some type of response from him?
Yeah i do.they are not needed.i think your dope grows just fine and im sure your buyers arnt complaining....So, I'd recommend watching the first 20 minutes of the video but to sum it all up, their findings show:
1. UV-B reduces overall yield and does NOT effect resin and terpene concentrations (production).
2. Far Red is expensive to produce and adding more white light (instead of far red) is just about equal in results but cheaper. The main advantage to the far red is stem elongation, although it reduces branch quantity.
I think the UV-B findings kind of runs contrary to Bruce Bigsby's studies but the far red is similar. I'm wondering if I just wasted $200 on the UV-B lights.........LOL I'm also wondering if I can send Bruce the video and try to solicit some type of response from him?
Kind of my point. Like obviously all three plants look awful (yes, even the control).Just for conversation purposes......the picture to the left above at day 46 shows you would probably still have 2.5-4 weeks left in flowering under normal circumstances. If you weren't going to start the UV-B until the last 2 weeks, the other pic's would be irrelevant, as would the decline in health of the plants. Usually, the last 2 weeks- most of the pistils have started to die off anyway and you are really in a "pod swelling and hardening" period with an increase of resin being produced on the empty pods that make up each cola.
My point is the health impact would be minimal if only given the UV-B the last few weeks, as the plants are in decline anyway. The main issue remains the increase of resin production under UV-B lights the last 2 weeks, and we now have conflicting info.
Here's another article I often refer to....... make sure to check the very bottom part that specifically talks about marijuana.
If you download the link on the post attached, you will get this paper. It is by far the best i have found on this subject in terms of breadth if nothing else. It appears to be more of a lit review than new research, but it is well-presented.Kind of my point. Like obviously all three plants look awful (yes, even the control).
If you have a healthy plant to start with, what does it look like?
Interestingly, the paper you linked suggests it's the UVA that may increase trich formation and the uvb is for the thc specifically.
View attachment 1097841
Somehow I think Bigsby has less skin in the game, and probably has a more scientific regimen. Fluence is trying to sell you lights, Bigsby is giving out information. I’ll give a whirl this grow, paying particular attention to leaf health and we’ll see how it goes.
I definitely think there is a danger to yield. I also think you would have to be an absolute imbecile to look at this and feel like you nailed it.
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Thought about this point again some more...those plants in the pic are all basically disasters. If my sugar leaves look like that halfway through week 7, I am incredibly angry with myself for how badly I have screwed up. I will expect sub-optimal results at harvest. I know this from experience.Just for conversation purposes......the picture to the left above at day 46 shows you would probably still have 2.5-4 weeks left in flowering under normal circumstances. If you weren't going to start the UV-B until the last 2 weeks, the other pic's would be irrelevant, as would the decline in health of the plants. Usually, the last 2 weeks- most of the pistils have started to die off anyway and you are really in a "pod swelling and hardening" period with an increase of resin being produced on the empty pods that make up each cola.
My point is the health impact would be minimal if only given the UV-B the last few weeks, as the plants are in decline anyway.
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