Cannabis Daily Light Integral

Slinging PAR · Mar 24, 2018

3GT said:
Thanks for that! Very interesting stuff, what effect does 1700ppfd@6hrs on have on flowering times? You said you use fr as well?

For flowering, no extra fr, just the Vero 29s in different color temps. 3000k 90 CRI seems to start flowering faster than 80 but they both finished up at the same time. Yields and quality were the same.

I want to try a run with 1750k at some point once some space frees up. Going to stick using Vero 29 SE C since they are easy to deal with and compare.

Rocket Soul · Mar 25, 2018

Slinging PAR said:
For flowering, no extra fr, just the Vero 29s in different color temps. 3000k 90 CRI seems to start flowering faster than 80 but they both finished up at the same time. Yields and quality were the same.

I want to try a run with 1750k at some point once some space frees up. Going to stick using Vero 29 SE C since they are easy to deal with and compare.

Very nice seeing someone experimenting with short flower times. What kind of flowering times did you get using 6/18 hour light cycle in comparison? When do you feel its more worth using this approach? How much more attention do you need to give the grow using these high lightlevels? I can imagine that the plants turn deficient easily if something is not on point. You have a thread on this going somewhere? Fascinating stuff

Randomblame · Mar 25, 2018

I could imagine that it is difficult to deal with mold/bud rod with such long nights. How did you manage this?

Slinging PAR · Mar 25, 2018

Randomblame said:
I could imagine that it is difficult to deal with mold/bud rod with such long nights. How did you manage this?

Keep RH down under 50%. I live in a desert area and have lots of airflow. 4 growing chambers for flower each getting 6 hours per day with only one being on at a time. Since the air circulates through all 4 chambers, there isn't really a lights off period where RH would spike. With 4 filters it smells like a hospital.

Rocket Soul said:
Very nice seeing someone experimenting with short flower times. What kind of flowering times did you get using 6/18 hour light cycle in comparison? When do you feel its more worth using this approach? How much more attention do you need to give the grow using these high lightlevels? I can imagine that the plants turn deficient easily if something is not on point. You have a thread on this going somewhere? Fascinating stuff

They are about the same. First I noticed I could get by with 8 hours per day so I ran 3 chambers. Then I added in some more cobs per chamber getting more light with less heat, dropped it to 6, then 5.5 and ended up settling on 6 to make it easy for 4 chambers.

Don't know how to answer your question about worth. There is probably some math involved to figure it out from whichever perspective is your focus. For me it is the flexibility which makes it worthwhile.

SIPs keep it balanced for the most part but the light adjustments depend on where it is in the flower cycle. I tie branches horizontal to use the space as best I can so that is a daily chore. I guess if you were lazy then you could let it go for a while without much interaction.

Yes you do have to keep everything in order. For seedlings and sick plants I put them under blurple in another chamber until they recover. All problems I have had have been during veg and I usually kill off the runts when trying a new strain.

3GT · Mar 25, 2018

I

Slinging PAR said:
Keep RH down under 50%. I live in a desert area and have lots of airflow. 4 growing chambers for flower each getting 6 hours per day with only one being on at a time. Since the air circulates through all 4 chambers, there isn't really a lights off period where RH would spike. With 4 filters it smells like a hospital.

They are about the same. First I noticed I could get by with 8 hours per day so I ran 3 chambers. Then I added in some more cobs per chamber getting more light with less heat, dropped it to 6, then 5.5 and ended up settling on 6 to make it easy for 4 chambers.

Don't know how to answer your question about worth. There is probably some math involved to figure it out from whichever perspective is your focus. For me it is the flexibility which makes it worthwhile.

SIPs keep it balanced for the most part but the light adjustments depend on where it is in the flower cycle. I tie branches horizontal to use the space as best I can so that is a daily chore. I guess if you were lazy then you could let it go for a while without much interaction.

Yes you do have to keep everything in order. For seedlings and sick plants I put them under blurple in another chamber until they recover. All problems I have had have been during veg and I usually kill off the runts when trying a new strain.

How much did flowering times change? Aka an 8 week strain under 12/12 takes eg: 7 weeks to mature under 6/18?

Slinging PAR · Mar 25, 2018

3GT said:
I

How much did flowering times change? Aka an 8 week strain under 12/12 takes eg: 7 weeks to mature under 6/18?

It is about the same, nothing noticeably different, a day or two on either side maybe?

sethimus · Mar 25, 2018

how often do you sleep per day?

3GT · Mar 25, 2018

sethimus said:
how often do you sleep per day?

One time for long time

sethimus · Mar 25, 2018

3GT said:
One time for long time

that question was for @Slinging PAR, not you...

Unagi · Mar 25, 2018

@Slinging PAR Im having a hard time buying ur what ur trying to sell. Seems to like running 4 flowering chambers the way you do is impossible for one person to keep going, 2 ppl can do the job ofcourse. Maybe 1 can get them to the finish line, but 1 or 2 of the rooms will suffer or your mental health.

Running something like this in a facility with many workers could be game changing, depends on the actual results 12/12 vs 6(on)/18(off). Is there any research done on the matter by any officials ?

Slinging PAR · Mar 25, 2018

sethimus said:
how often do you sleep per day?

Enough.

Unagi said:
@Slinging PAR Im having a hard time buying ur what ur trying to sell. Seems to like running 4 flowering chambers the way you do is impossible for one person to keep going, 2 ppl can do the job ofcourse. Maybe 1 can get them to the finish line, but 1 or 2 of the rooms will suffer or your mental health.

Running something like this in a facility with many workers could be game changing, depends on the actual results 12/12 vs 6(on)/18(off). Is there any research done on the matter by any officials ?

Probably because I am not selling anything.

Impossible? Have you tried it yourself? Don't assume others have your limitations, lots of people like gardening.

Officials? You mean the grow bros with youtube videos or a recognized research entity? There are many completed and ongoing research projects at lots of universities so feel free to do your own homework.

Rocket Soul · Mar 25, 2018

Slinging PAR said:
It is about the same, nothing noticeably different, a day or two on either side maybe?

Thats quite surprising, ive heard longer nights leads to faster finishing times. I think i saw @torontoke doing short flower hours at great effect. But not with such extreme light levels.

Slinging PAR · Mar 25, 2018

Rocket Soul said:
Thats quite surprising, ive heard longer nights leads to faster finishing times. I think i saw @torontoke doing short flower hours at great effect. But not with such extreme light levels.

For me it is pretty subjective when it comes finish time. It might be shorter and I may be leaving them in flower longer as a result. If it is around the time they should be finishing, eg. 8 weeks, then it is a situational call as to harvest or keep going. Sometimes scheduling gets in the way delaying an extra day or two for example.

Rocket Soul · Mar 25, 2018

Slinging PAR said:
For me it is pretty subjective when it comes finish time. It might be shorter and I may be leaving them in flower longer as a result. If it is around the time they should be finishing, eg. 8 weeks, then it is a situational call as to harvest or keep going. Sometimes scheduling gets in the way delaying an extra day or two for example.

Ok, but nothing like 10-14 days? Do you see a any discernible difference from strain to strain in finishing faster due to shorter light cycle? Its really interesting to see people doing things different and getting some contrasting info.

Unagi · Mar 25, 2018

Slinging PAR said:
Enough.

Probably because I am not selling anything.

Impossible? Have you tried it yourself? Don't assume others have your limitations, lots of people like gardening.

Officials? You mean the grow bros with youtube videos or a recognized research entity? There are many completed and ongoing research projects at lots of universities so feel free to do your own homework.

Do you have a name for this type of light schedual? im happy to research on my own, just having a hard time finding the studies. English is not my first language so finding research studies can be tricky at times.

Its great you can manage to run 4 flowering chambers at once. Please feel to share how you run your setup, maybe we can learn some?

Slinging PAR · Mar 25, 2018

Rocket Soul said:
Ok, but nothing like 10-14 days? Do you see a any discernible difference from strain to strain in finishing faster due to shorter light cycle? Its really interesting to see people doing things different and getting some contrasting info.

I have only been doing this light schedule for a year now with 2 different strains. Before that I was hitting them with light for too long so I think they were flowering as fast as possible back then.

ttystikk · Mar 25, 2018

Slinging PAR said:
I have only been doing this light schedule for a year now with 2 different strains. Before that I was hitting them with light for too long so I think they were flowering as fast as possible back then.

It sounds like you have those two strains really dialed in. What are they? Are you running from seeds or clones? I wonder what you'd see if you started trying more varieties.

Have you done the usual gpw (grams per watt) calculation? What were your results? I'm aware that the formula does not account for shorter days, but it would be interesting to see.

You're giving me ideas. I like that!

ANC · Mar 26, 2018

I threw one of the cheese plants outdoors last winter.
She finished up about 2 weeks later, but I also let her run to more ripeness than the indoor ones.

The plant got maybe 4 hours of direct afternoon sunlight every day, the rest was just reflected light. SHe outyielded the indoor plants, but was in a larger pot and had my root treatment.

Randomblame · Mar 26, 2018

ANC said:
I threw one of the cheese plants outdoors last winter.
She finished up about 2 weeks later, but I also let her run to more ripeness than the indoor ones.

The plant got maybe 4 hours of direct afternoon sunlight every day, the rest was just reflected light. SHe outyielded the indoor plants, but was in a larger pot and had my root treatment.

You lucky guy, a cheese plant outdoors and not stolen right before harvest...?! I could never do that where I live, lol!
The smell would alert the neighborhood and I would have to stand guard day and night, lol!

Slinging PAR · Mar 26, 2018

ttystikk said:
It sounds like you have those two strains really dialed in. What are they? Are you running from seeds or clones? I wonder what you'd see if you started trying more varieties.

Have you done the usual gpw (grams per watt) calculation? What were your results? I'm aware that the formula does not account for shorter days, but it would be interesting to see.

You're giving me ideas. I like that!

Yes, they are dialed in pretty well. Indica dominant hybrid and a sativa that I can only run once a year because it fills up my storage limit. I run both seeds and clones, primarily seeds picking out a good plant from 20 or so to take some cuttings to keep going. Since I know what to expect from these two I haven't ventured far off other than dabbling with a couple of other plants for some variety.

My gpw calculations will be a lot different than how most do it. Farmers use yield per area per grow cycle (year) and I tend to do the same. When calculating power, I take into account total power used (kw hours) since I increase power usage during the grow cycle but that could be broken down into an average over the course of a grow. Plus I veg my plants elsewhere that includes some natural sunlight so how is that accounted for?

My flower chambers are one square meter and are yielding 900-1300g/m2 for the hybrid and 1500-1800g/m2 for the sativa. 7-8 week flower versus 14-16 weeks for the sativa. It is a bit of work to keep everything tidy but the results are worth it.

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