65 DLI and lighting schedules

[RastaDaddy]

The cabin is 400' from an overflow channel of the rvr. Late spring, summer and fall I pump water to cabin. Solar works perfect for this. Pumps I use are small and use little juice. As freeze-up begins I haul buckets with sled and 4x4.After the overflow channel freezes and drifts over with deep snow I start filling buckets of snow from the huge drifts in front of cabin. I mine where dogs haven't trashed the snow by digging and peeing, lol. Just an 80' walk with buckets that aren't very heavy compared to a water bucket.

Does underground water freeze at near 0 °C temperatures? What's the math on that? I plan on building a big ass house in the woods.

 

[Drownomatic]

My research indicates that I won't get a linear gain vs amount of electricity used. I pay about 40 cents/kWh after all taxes etc.

Any failure of the CO2 burns the plants very quickly.

It really needs a closed system.

It requires more effort than I am currently expending. <---------------------

 

[RastaDaddy]

Most here are probably talking about autoflowers, which can’t handle as high dli…

That might probably be true. But is it scientific? If there are papers about comparing photos and autos, I'd love to read them Frank.

 

[RastaDaddy]

My research indicates that I won't get a linear gain vs amount of electricity used. I pay about 40 cents/kWh after all taxes etc.

Any failure of the CO2 burns the plants very quickly.

It really needs a closed system.

It requires more effort than I am currently expending. <---------------------

Yes, costs and gains are not linear statistics. But the science is there. You can always have PVs up for the task, and you don't have to think about monthly payments(except for maybe the monthly payments of the PVs Lmfao).

 

[Frankthetank]

That might probably be true. But is it scientific? If there are papers about comparing photos and autos, I'd love to read them Frank.

Probably not. There are charts out there if you do a search. I speak from a solid decade plus of experience…

For example: I would call this a rough estimate….but much over 60 will cause problems in most situations….

 

[Lil Dab]

That's probably mostly because either you give it less CO2 than it needs, or some other stressor. The plant easily surpasses and can get up to 100 DLI in some of the cutting-edge study papers I've read, with increases in dry mass up until that point as well! If you want, I can share the papers with you. It is by Bruce Bugbee and another Ph.D. student.

According to Dr. Bruce Bugbee's research, cannabis can tolerate very high Daily Light Integral (DLI) levels, potentially as high as
60 to over 100 mol/m²/day, provided all other environmental factors (specifically CO2, nutrients, and temperature) are optimized.
Key points from his research and discussions:

• High Tolerance: Dr. Bugbee has noted that cannabis can handle DLI levels up to and potentially exceeding the DLI found in natural full sunlight on a clear summer day (which can reach 60 mol/m²/day or more).
• Optimal Conditions are Key: Pushing to these extreme DLI levels is only effective if other conditions are perfectly dialed in. High light intensity in a poor environment (e.g., inadequate nutrients or CO2, incorrect temperature/VPD) can lead to stress or light burn.
• CO2 Enrichment: Dr. Bugbee emphasizes that CO2 enrichment (to around 1200 ppm) is crucial to leverage high light intensities and avoid diminishing returns or yield dilution.
• • Diminishing Returns: For many home growers not supplementing CO2, a DLI near 40 mol/m²/day may be a practical point of diminishing returns before needing advanced environmental controls.
  • Variations by Stage: While high DLI can be beneficial during mid-to-late flower, some growers, referencing his work, suggest slightly reducing DLI in very late flower to potentially avoid issues like "foxtailing" (a type of abnormal bud formation).

In summary, while cannabis can technically tolerateextremely high DLI under optimized, research-level conditions, a more common and achievable high DLI range for advanced growers is often considered to be around 45-60 mol/m²/day when using CO2 supplementation.

 

[Frankthetank]

According to Dr. Bruce Bugbee's research, cannabis can tolerate very high Daily Light Integral (DLI) levels, potentially as high as
60 to over 100 mol/m²/day, provided all other environmental factors (specifically CO2, nutrients, and temperature) are optimized.
Key points from his research and discussions:

• High Tolerance: Dr. Bugbee has noted that cannabis can handle DLI levels up to and potentially exceeding the DLI found in natural full sunlight on a clear summer day (which can reach 60 mol/m²/day or more).
• Optimal Conditions are Key: Pushing to these extreme DLI levels is only effective if other conditions are perfectly dialed in. High light intensity in a poor environment (e.g., inadequate nutrients or CO2, incorrect temperature/VPD) can lead to stress or light burn.
• CO2 Enrichment: Dr. Bugbee emphasizes that CO2 enrichment (to around 1200 ppm) is crucial to leverage high light intensities and avoid diminishing returns or yield dilution.
• • Diminishing Returns: For many home growers not supplementing CO2, a DLI near 40 mol/m²/day may be a practical point of diminishing returns before needing advanced environmental controls.
  • Variations by Stage: While high DLI can be beneficial during mid-to-late flower, some growers, referencing his work, suggest slightly reducing DLI in very late flower to potentially avoid issues like "foxtailing" (a type of abnormal bud formation).

In summary, while cannabis can technically tolerateextremely high DLI under optimized, research-level conditions, a more common and achievable high DLI range for advanced growers is often considered to be around 45-60 mol/m²/day when using CO2 supplementation.

I betcha genetics play a major factor in how well they’ll do under high dli conditions. Certain cultivars will take way more abuse than others…. Not just photos vs autos… but individual strains within each category. Furthermore, the outliers that can take the extreme abuse aren’t the norm.

Pushing plants to and beyond their limits can be an interesting experiment, but to grow reliably consistent, quality bud…you’ll want a dialed environment that is suitable for whatever cultivars you stick in it.

 

[Lil Dab]

I betcha genetics play a major factor in how well they’ll do under high dli conditions. Certain cultivars will take way more abuse than others…. Not just photos vs autos… but individual strains within each category. Furthermore, the outliers that can take the extreme abuse aren’t the norm.

Pushing plants to and beyond their limits can be an interesting experiment, but to grow reliably consistent, quality bud…you’ll want a dialed environment that is suitable for whatever cultivars you stick in it.

Oh for sure every pheno is different my main take away is having everything dialed in perfect is a must for the plants to handle it. If it’s not then they can’t and at what expense quality and quantity so is it really worth it to push your plants and lights that hard? I know I have had 1lb dry weight autos with less then 50dli@18/6

 

[Frankthetank]

Oh for sure every pheno is different my main take away is having everything dialed in perfect is a must for the plants to handle it. If it’s not then they can’t and at what expense quality and quantity so is it really worth it to push your plants and lights that hard? I know I have had 1lb dry weight autos with less then 50dli@18/6

All those monster plants I grew back in the day were under those auto cobs… and the dli was in the low 40’s…

 

[RastaDaddy]

All those monster plants I grew back in the day were under those auto cobs… and the dli was in the low 40’s…

Guess I'll be the one trying to push the plants to extremes, at least 65 DLI is what I'll give 'em! I'll start logging once I start the operation, my friends. Stay tuned. If 420 did it, autopotamus did it, why couldn't others?

-RD