using UV to put plants to sleep

[torontoke]

Yes,



I too got around >75% at 6 and when maximizing lumin out put by every way I could while still running 1K's (Jupiter 6 hoods = 20% more reflected light, new bulbs {155,000} metering out at 179K to 183K per {Interesting spread - bulb variation}). I got very close to 90% at the the 7 hr point test.

Conversely, On the 730nm LED - Giving you 2 more hrs of lights on time. The rise in yield was minimal from my normal 11 and was not (mathematically) worth the added electrical cost!

So, another point of view by testing from another member, qualifies your findings....Also point given on the 730nm LED value. Hell the cost of the 2 LED's I bought were not even worth it....Another "collective" member bought them from me to do his own testing on the subject, following standards of a similar test at MSU on C3 fruiting plants in the squash, Bean and tuber family's.

Still awaiting results on that..

Doc

Thank you for helping make me feel a lil bit better about some of the things i have been saying on my own thread for a long time now.
Ive been told i was nuts or it wasnt a worthwhile project to bother with since i started.
And thank you @ttystikk for bringing me into the discussion im always happy to read that im not nuts.
Or well at least not all the way nuts.

 

[ttystikk]

Thank you for helping make me feel a lil bit better about some of the things i have been saying on my own thread for a long time now.
Ive been told i was nuts or it wasnt a worthwhile project to bother with since i started.
And thank you @ttystikk for bringing me into the discussion im always happy to read that im not nuts.
Or well at least not all the way nuts.

I don't think you're even a little bit nuts- at least, not about growing! The problem is that you're trying to be rational in an irrational world, lol

If you got 75% if your yield with 50% of the light time, then you'll get more weed, if you use more space and manpower... so I'm not sure how far ahead you end up there.

On the other hand, I'm actually pretty curious about a head to head comparison of 8 hours of light per 24 vs 12. If it doesn't lose much yield, this could be an interesting way forward!

Here's another thought, it may have been mentioned before; With a programmable cycle timer, you could conceivably run eight on and twelve off, which would mean the same overall light interval but now every day cycle lasts only twenty hours- might that shorten the blooming time by twenty percent as well? If the cycle is thus made shorter but yields remain the same or close, that's real progress!

 

[Dr. Who]

I don't think you're even a little bit nuts- at least, not about growing! The problem is that you're trying to be rational in an irrational world, lol

If you got 75% if your yield with 50% of the light time, then you'll get more weed, if you use more space and manpower... so I'm not sure how far ahead you end up there.

On the other hand, I'm actually pretty curious about a head to head comparison of 8 hours of light per 24 vs 12. If it doesn't lose much yield, this could be an interesting way forward!

Here's another thought, it may have been mentioned before; With a programmable cycle timer, you could conceivably run eight on and twelve off, which would mean the same overall light interval but now every day cycle lasts only twenty hours- might that shorten the blooming time by twenty percent as well? If the cycle is thus made shorter but yields remain the same or close, that's real progress!

Hmm, another interesting idea!

I think I may pick up a cpl of programmables when I'm out today..

Doc

 

[churchhaze]

Im not gonna read a thread. Answer the question.. im well aware of how uv and red effects flowering

Look up phytochromes. Darkness will cause Pfr to slowly convert to Pr, but 730nm (far-red) will do this quickly. 660nm (deep red, looks the same really) will convert the majority of Pr back to Pfr (about 85% of total phyotochromes in Pfr form).

Pfr is the active form and Pr is the inactive form. The % of total phytochromes in Pfr form controls a bunch of things directly through genetic expression.

The UV thing is COMPLETELY wrong however.

Besides controlling circadian rhythm, the % of phytochrome in Pfr form determines the stretch rate (logarithmically proportional to %Pfr where 85% stretches the least).

Far-red will also inhibit the germination of lettuce seeds, while red light will promote germination. Actually, it's only the last pulse in a sequence of pulses that matters. So if you pulse R, FR, R, FR, only the last, FR, will matter, and thus it will inhibit germination. If the sequence was R, FR, R, FR, R, it would promote germination.

 

[GroErr]

Look up phytochromes. Darkness will cause Pfr to slowly convert to Pr, but 730nm (far-red) will do this quickly. 660nm (deep red, looks the same really) will convert the majority of Pr back to Pfr (about 85% of total phyotochromes in Pfr form).

Pfr is the active form and Pr is the inactive form. The % of total phytochromes in Pfr form controls a bunch of things directly through genetic expression.

The UV thing is COMPLETELY wrong however.

Besides controlling circadian rhythm, the % of phytochrome in Pfr form determines the stretch rate (logarithmically proportional to %Pfr where 85% stretches the least).

Far-red will also inhibit the germination of lettuce seeds, while red light will promote germination. Actually, it's only the last pulse in a sequence of pulses that matters. So if you pulse R, FR, R, FR, only the last, FR, will matter, and thus it will inhibit germination. If the sequence was R, FR, R, FR, R, it would promote germination.

Good explanation, this is why I'm trying the 10 min 660nm before lights on, and 730nm for 10 min after lights out. The science is there. If you could get say a net gain of 1 hour on each end of light/dark growth phases (by speeding up the change from pfr to pr or vice-versa), that could translate into either weight gains, or more likely reduced cycle times. e.g. 2 hrs. of gain per 12 hr. cycle, would be 2 % 12 = 16%. For an 8 week strain, 16% of 56 = 9 days. idk if there's such a direct gain, just an example. But if I can shave a week off per cycle, that's an extra cycle per year gained. Worth trying out imo. I have these clones going from a strain that normally goes 56 days, this bud below is at day 42/6 weeks and looking more like 7 weeks in, don't expect them to go much more than 50 days at this rate.