Seedling LED light stress??? AC Infinity EVO4

Smokenpassout · 2025-05-19T06:04:12-0600

Small seedlings 3 nodes just moved from CFL under AC Infinity EVO 4 after transplant to final pots. I see one seedling with minor leaf upcurling, at edge of leaf, this morning! I have turned light down to lowest setting of 10% down from 20%, although manufacturer says 40% for seedlings. Light is 25” over seedlings. Any tips for using powerful Leds over very tiny plants please share. A final observation seedling look a little pale green to me today. They have had one microdose of 1ml calmag, 1ml micro, 1ml grow. Last watering was plain for transplant. So Im thinking another microdose of nutrients in 4-5 days? Other variables temp 72-73 and humidity 65%. Please share your thoughts?

1212ham · 2025-05-19T10:47:29-0600

Smokenpassout said:
Small seedlings 3 nodes just moved from CFL under AC Infinity EVO 4 after transplant to final pots. I see one seedling with minor leaf upcurling, at edge of leaf, this morning! I have turned light down to lowest setting of 10% down from 20%, although manufacturer says 40% for seedlings. Light is 25” over seedlings. Any tips for using powerful Leds over very tiny plants please share. A final observation seedling look a little pale green to me today. They have had one microdose of 1ml calmag, 1ml micro, 1ml grow. Last watering was plain for transplant. So Im thinking another microdose of nutrients in 4-5 days? Other variables temp 72-73 and humidity 65%. Please share your thoughts? I would think it can take 20% light with 3 nodes.

A picture is worth a thousand words. I wouldn't expect 20% to be a problem with 3 nodes.

1

Post in thread 'Can I start a grow (photoperiod) with a bad light'

Oct 26, 2024

Built said:
Ahh ok, Be interesting to put it beside an actual light metre, and see the difference, but they are too pricy for me from what i just looked up.

You can get the UNI-T lux meter for about $20. I use the $35 bluetooth version that pairs with the free PPFD Meter app, a nice setup.
Several have compared it to good PAR meters. There's good info in this thread and you can find many posts by searching Rollitup for uni-t.

Recommendation: Cheap PPFD meter?

Hookers and blow? I like the way you think. But does sound fun. Lmao

www.rollitup.org

BTW, screw in LED's work well, but not as efficient as good grow lights.

green valley grows · 2025-05-20T10:10:22-0600

I have an EVO 4 as well. I stopped using it for seedlings. I just felt that even at its lowest light setting it was too much. I gained a lot of success by switching over to the AC Infinity Ion beams for my seedlings. I know the Ion beams are for side lighting but they are full spectrum and have good led's in them. Hard to hurt your baby girls with them. Once they grow a bit I put them in the tent with the EVO 4.

Delps8 · 2025-05-20T14:09:48-0600

1212ham said:
A picture is worth a thousand words. I wouldn't expect 20% to be a problem with 3 nodes.

1

Post in thread 'Can I start a grow (photoperiod) with a bad light'

Oct 26, 2024

Built said:

Ahh ok, Be interesting to put it beside an actual light metre, and see the difference, but they are too pricy for me from what i just looked up.

Click to expand...

You can get the UNI-T lux meter for about $20. I use the $35 bluetooth version that pairs with the free PPFD Meter app, a nice setup.
Several have compared it to good PAR meters. There's good info in this thread and you can find many posts by searching Rollitup for uni-t.

Recommendation: Cheap PPFD meter?

Hookers and blow? I like the way you think. But does sound fun. Lmao

www.rollitup.org

BTW, screw in LED's work well, but not as efficient as good grow lights.

1212ham

At that hang height and that dimmer setting, the PPFD is about 260µmol. At 10%, the plants are getting ~100µmol. Cannabis starts to die at ~60µmol so at 10% and 25" the OP is almost in "flat spin" territory.

Cannabis is able to use a staggering amount of light. At "three nodes" (~14 days?) 20% at 18"//260µmol is a bit low (300 is the conventional wisdom). If the plants are tacoing at 260 in week 2-3, something's wrong with the plants.

Given that it's just one plant and "minor uncurling", perhaps that issue is resolved and the OP has moved on. If he keeps it at 10%, though, this story will not have a happy ending.

Delps8 · 2025-05-20T14:36:23-0600

green valley grows said:
I have an EVO 4 as well. I stopped using it for seedlings. I just felt that even at its lowest light setting it was too much. I gained a lot of success by switching over to the AC Infinity Ion beams for my seedlings. I know the Ion beams are for side lighting but they are full spectrum and have good led's in them. Hard to hurt your baby girls with them. Once they grow a bit I put them in the tent with the EVO 4.

The Evo has a hot spot in the middle which can make it tricky to light a grow well but, if you've got the extra light, you can use it for a "fill light".

I bought a Vipar XS 1500 to unf*ck a grow where I foolishly tried to use one light to cover two plants of very different sizes (my first "Twins" grow, named after the movie with Schwarzenegger and de Vito).

Yeh, dumbshit move on my part. The pisser is that the tall plant fox tailed. :-(

The little Vipar did a great job

I use it as a fill light now.

1/17/25 Vipar is feeding Erica an average of 890µmol over 5 sample points.

And another light for the "front row", a 2020 Mars SP3000 that I retired when I switched to separate veg and grow lights.

Seedling LED light stress??? AC Infinity EVO4

Smokenpassout

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1212ham

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Post in thread 'Can I start a grow (photoperiod) with a bad light'

Recommendation: Cheap PPFD meter?

green valley grows

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Delps8

Well-Known Member

Post in thread 'Can I start a grow (photoperiod) with a bad light'

Recommendation: Cheap PPFD meter?

Delps8

Well-Known Member

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