PPFD for Vegetative state

bellyofthebest

Active Member
I’ve read a bunch of scholar journals proving Cannabis flowering excels at PPFD of 1500 even past 1800+ indoors. What I can’t seem to find is conclusive evidence on ideal veg ppfd numbers.

At the moment I’m running 3 week old clones with 300-550 ppfd planning on 900 for veg once they have some legs under em.

What works for you all? I’m using Apogees MQ-100 for ppfd readings.
 

Rocket Soul

Well-Known Member
1500 umols seems like too much to me from what we've experienced. If it's your first flower try 750-900 in flower.
900 in veg is going to lead to shitty deficient plants with a high degree of certainty.

The way to do LED intensity is to start out soft and with the light a bit backed off, and then up intensity slowly, keeping a sharp eye for signs of plant stress and stopping when that happens until you see the plant growing happily again. Trying to force your plant to eat 1500 umols without concerns of plant health is a surefire way of a failed grow.
 

Southernontariogrower

Well-Known Member
1500 umols seems like too much to me from what we've experienced. If it's your first flower try 750-900 in flower.
900 in veg is going to lead to shitty deficient plants with a high degree of certainty.

The way to do LED intensity is to start out soft and with the light a bit backed off, and then up intensity slowly, keeping a sharp eye for signs of plant stress and stopping when that happens until you see the plant growing happily again. Trying to force your plant to eat 1500 umols without concerns of plant health is a surefire way of a failed grow.
Listen to rocket, lm an intense grower, no veg, 8 inch into flower full power 1 ft away, maybe 2 ft. Let them grow into it, was vegging under 1k hps so tough little girls. My light rated 1482 umol so about 1080 useable. I like to get most from light. I push them but lve had lots of problems long before leds were a thing. Just gave an edge where therecwasnt one. How much co2? Using ?
 

Southernontariogrower

Well-Known Member
I’ve read a bunch of scholar journals proving Cannabis flowering excels at PPFD of 1500 even past 1800+ indoors. What I can’t seem to find is conclusive evidence on ideal veg ppfd numbers.

At the moment I’m running 3 week old clones with 300-550 ppfd planning on 900 for veg once they have some legs under em.

What works for you all? I’m using Apogees MQ-100 for ppfd readings.
How much co2 using ???
 

Southernontariogrower

Well-Known Member
Thanks for all the responses and the useful chart. Co2 in veg currently is 1000 ppm with temps between 78-83 and 50 ish humidity.
Id say about 800 if pushing hard, any higher in veg they will freak out! Maybe 700 with less problems. I have hard time veg. I grow in flower. Let them tell you, id dim to 50% for 18-6, 100% 12x12 you are wasting co2 atm, higher co2 higher light more feed. Id go 600ppm 600 ppfd 60% nutes 666 always works!
 

HippieDudeRon

Well-Known Member
I would tell anyone wondering about "intensity" to think of it on a DLI(daily light integral) level not just an instantaneous PPFD measurement.

Outdoors there are fluctuations and general rising and falling with the sun. True light integrals never reach 18 hrs outdoors so reference intensity indoors to out are kind of moot.

Once you get to 35 mols DLI(flower or veg), you really have to be on top of your game to push much past that positively IME.

DLI chart.png
 

salmonetin

Well-Known Member
1620821957027.png

Values in Light Pink represent Typical Target DLI Amounts

500 uMole
represents a Typical Desirable Light Intensity
for indoor Early Stage Growth.

1000 uMole is a High Level Intensity for both indoor and Greenhouse Supplemental Lighting
for Late Stage and Flowering Growth.

1500 uMole is a Typical Plant Saturation Level
for High DLI Crops.

2000 uMole is a Typical Maximum Natural Sun Output on a Clear Day.

....i prefer the chart of LEDTonic Blog...mucho amor a los autores de ambas cartas...mil gracias por compartirlas...

DLI (Daily Light Integral) Chart - Understand your Plants' PPFD & Photoperiod Requirements

1620821678483.png



Erik Runkle:
CropDLI
Vegetative cuttings (liners) - early4-6
Vegetative cuttings (liners) - late6-10
Seedlings (plugs) - early6-10
Seedlings (plugs) - late10-15
Shade plants (annuals and perennials)6-10
Foliage plants6-10
Potted bulbs6-15
Stock plants (for cuttings)10-20
Annual bedding plants10+
Leafy greens and herbs12+
Potted flowering plants12+
Shrubs12+
Cut flowers15+
Fruiting vegetables15+


Dr, Lynette Morgan:
CropDLI
Violets, orchids, ferns4-6
Seedlings/cuttings6-8
Small herbs10-12
Butterhead lettuce14-16
Cucumber20-30
Capsicum20-30
Eggplant20-30
Tomatoes22-30




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1620831008053.png

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