Amount of light?

[SHRED]

I'm running the light for these at about 400 PPFD and 26 DLI.

They are 19 days old and I'm considering upping their light intake soon.

They are responding well although I may be pushing them a little.

What do you think of my light plans?

.

 

[Death The Cultivator]

I'm running the light for these at about 400 PPFD and 26 DLI.

They are 19 days old and I'm considering upping their light intake soon.

They are responding well although I may be pushing them a little.

What do you think of my light plans?

.View attachment 1477864View attachment 1477867

I would stay course until the stretch begins, they are still very short without much leaf.

 

[Delps8]

I'm running the light for these at about 400 PPFD and 26 DLI.

They are 19 days old and I'm considering upping their light intake soon.

They are responding well although I may be pushing them a little.

What do you think of my light plans?

.View attachment 1477864View attachment 1477867

Why do you think you're "pushing them"? I don't see any sign of having too much light and, dollars to doughnuts, they can use a lot more light than you're giving them.

What light are you using and what's your lighting schedule?

The graphic that you've posted is their light plan for photos. Their recommendation for autos is 45 mols across the board. Once cannabis hits veg, you can immediately ramp up light levels because cannabis can handle extremely high amounts of light, assuming that your grow environment is sound. Of course, watch your plants. If you see signs of light stress - light avoidance or bleaching - reduce the PPFD until the plants have matured a bit and then try to increase the light level again.

Back to the graphic - I've corresponded with their programmer a few times since I tested "Korona" (now called "Photone") early last year. In an email to him a few months ago, I raised the issue that this looked like a graph for photos and he agreed. When I asked him for a recommendation about autos he replied "As for the DLI question: From my understanding auto-flowers can be treated as being “always in veg” so I’d stick to a DLI of 45 until harvest." I also enquired about sources for the recommendations and he pointed me toward the citations on their website.

That means that their recommendations are not based on research, rather they're passing along the recommendations that they see from other companies in the cannabis industry. It's very important to understand the source of the information that someone is using to pass along a recommendation.

In short, 45 mols will get you a long way but we know that cannabis can grow well with a DLI of up to 65 mols (again, assuming that your grow environment is sound), with an upper limit of ≈ 900 µmols. If you're lighting 24/0, you'll want to go to 750± µmols or up to 900 µmols if you're using 18/6.

 

[SHRED]

Why do you think you're "pushing them"? I don't see any sign of having too much light and, dollars to doughnuts, they can use a lot more light than you're giving them.

What light are you using and what's your lighting schedule?

The graphic that you've posted is their light plan for photos. Their recommendation for autos is 45 mols across the board. Once cannabis hits veg, you can immediately ramp up light levels because cannabis can handle extremely high amounts of light, assuming that your grow environment is sound. Of course, watch your plants. If you see signs of light stress - light avoidance or bleaching - reduce the PPFD until the plants have matured a bit and then try to increase the light level again.

Back to the graphic - I've corresponded with their programmer a few times since I tested "Korona" (now called "Photone") early last year. In an email to him a few months ago, I raised the issue that this looked like a graph for photos and he agreed. When I asked him for a recommendation about autos he replied "As for the DLI question: From my understanding auto-flowers can be treated as being “always in veg” so I’d stick to a DLI of 45 until harvest." I also enquired about sources for the recommendations and he pointed me toward the citations on their website.

That means that their recommendations are not based on research, rather they're passing along the recommendations that they see from other companies in the cannabis industry. It's very important to understand the source of the information that someone is using to pass along a recommendation.

In short, 45 mols will get you a long way but we know that cannabis can grow well with a DLI of up to 65 mols (again, assuming that your grow environment is sound), with an upper limit of ≈ 900 µmols. If you're lighting 24/0, you'll want to go to 750± µmols or up to 900 µmols if you're using 18/6.

Thanks for this detailed reply!

I'm running 18/6.

 

[Delps8]

Thanks for this detailed reply!

I'm running 18/6.

What light are you using?

 

[SHRED]

What light are you using?

Viparspectra KS3000

https://www.viparspectra.com/products/viparspectra%C2%AE-ks3000-300w-led-grow-light

 

[Delps8]

Viparspectra KS3000

https://www.viparspectra.com/products/viparspectra%C2%AE-ks3000-300w-led-grow-light

Very nice light. Check out the PPFD maps here, here, and here. I first saw the PPFD chart for the KS7000 a few months ago and my jaw hit the floor - it was pretty clear that uniformity was one of their design goals and they hit it out of the park. They've done really good job with the KS3000, as well.

From the product page at VS, they're recommending 75% power, 18/6 at 24" in veg and then 100%, 12/12 at 12" in flower.

Using the 24" chart at ppfdcharts.com, the average PPFD is 704 µmols. The page at Coco shows that output is really close to linear as dimmer percentage changes so the 704 @ 75% will be 528. At 18/6, that's a DLI of 34 mols.

For flower, their recommendation of 100% at 12/12 will give you an average of 802 µmols (from ppfdcharts) and that will get a DLI of 34.6.

You can't go wrong with those numbers but…

To my eye, that 100% at 12" or 14" looks pretty good. That will get you > 800 across a significant portion of the canopy and, per ppfdcharts, almost 90% will be > 700 µmols. That's a marked increase over the veg recommendation from VS and, assuming the other factors in your grow are in line, you should get a good jump in yield compared to what VS is recommending.

I've attached a screenshot of a slide in a Bugbee video that lays out the components of the grow environment. It can help answer "OK, what else to I have to think about?"

 

[SHRED]

Very nice light. Check out the PPFD maps here, here, and here. I first saw the PPFD chart for the KS7000 a few months ago and my jaw hit the floor - it was pretty clear that uniformity was one of their design goals and they hit it out of the park. They've done really good job with the KS3000, as well.

From the product page at VS, they're recommending 75% power, 18/6 at 24" in veg and then 100%, 12/12 at 12" in flower.

Using the 24" chart at ppfdcharts.com, the average PPFD is 704 µmols. The page at Coco shows that output is really close to linear as dimmer percentage changes so the 704 @ 75% will be 528. At 18/6, that's a DLI of 34 mols.

For flower, their recommendation of 100% at 12/12 will give you an average of 802 µmols (from ppfdcharts) and that will get a DLI of 34.6.

You can't go wrong with those numbers but…

To my eye, that 100% at 12" or 14" looks pretty good. That will get you > 800 across a significant portion of the canopy and, per ppfdcharts, almost 90% will be > 700 µmols. That's a marked increase over the veg recommendation from VS and, assuming the other factors in your grow are in line, you should get a good jump in yield compared to what VS is recommending.

I've attached a screenshot of a slide in a Bugbee video that lays out the components of the grow environment. It can help answer "OK, what else to I have to think about?"

Thank you for this.

I'm at 24" 50% power right now.

Should I go to 75% at 24" soon?

 

[Delps8]

Thank you for this.

I'm at 24" 50% power right now.

Should I go to 75% at 24" soon?

I'm not avoiding your question but, how did you determine that your DLI is 26//how are you getting PPFD readings?

 

[SHRED]

I'm not avoiding your question but, how did you determine that your DLI is 26//how are you getting PPFD readings?

I'm using my Samsung S21 and the Photone app which I calibrated using the Viparspectra charts.
Thanks