Photone App, LUX, Light Stress

Dothraki · Feb 1, 2022

Anyone have experience with using Lux readings with LEDs? I’ve been having issues that look like light stress, but according to the Photone app I’m only at 30,000 Lux. I’m 6 weeks of flower tomorrow and 30,000 Lux seems to be stressing them. 2 plants under different lights but both around 30,000 Lux @ 6 weeks flower

Plant 1. Cupped leaves, yellowing, fox tailed bud.

Plant 2 Losing color in bud leaves, veins still green.

freezeland2 · Feb 1, 2022

My plants are 5 weeks in veg. Anything over 20000 lux begins stressing them. LEDs can be strong.

Dothraki · Feb 1, 2022

freezeland2 said:
My plants are 5 weeks in veg. Anything over 20000 lux begins stressing them. LEDs can be strong.

Thanks that makes me feel better. I thought I was going crazy, trying to keep them going a couple more weeks. Do you turn the light up during the last week or 2 or just keep it under 20,000?

growsince79 · Feb 1, 2022

My LSD girl is the same age. One meter shows 37k lux the other says 59k lux. Which one is right? idk but the light is where it needs to be.

freezeland2 · Feb 1, 2022

Dothraki said:
Thanks that makes me feel better. I thought I was going crazy, trying to keep them going a couple more weeks. Do you turn the light up during the last week or 2 or just keep it under 20,000?

I’ll let the plants tell me.

SofaKingHigh · Feb 1, 2022

Dothraki said:
Anyone have experience with using Lux readings with LEDs? I’ve been having issues that look like light stress, but according to the Photone app I’m only at 30,000 Lux. I’m 6 weeks of flower tomorrow and 30,000 Lux seems to be stressing them. 2 plants under different lights but both around 30,000 Lux @ 6 weeks flower

Plant 1. Cupped leaves, yellowing, fox tailed bud.
View attachment 1212658

Plant 2 Losing color in bud leaves, veins still green.
View attachment 1212661 View attachment 1212662

Are you using a defuser on your phone? I’m trying to use this app as well. Why not use DLI for your reading or ppfd?

Observationist · Feb 1, 2022

I use tentbuddy or growbuddy on android. Along with PPFD meter those seem to the most accurate ~10% on Motorola one action and iPhone 8

freezeland2 · Feb 1, 2022

SofaKingHigh said:
Are you using a defuser on your phone? I’m trying to use this app as well. Why not use DLI for your reading or ppfd?

They do need a diffuser for sure with an iphone. I like the app and measure DLI, ppfd, and lux with it.

SofaKingHigh · Feb 1, 2022

freezeland2 said:
They do need a diffuser for sure with an iphone. I like the app and measure DLI, ppfd, and lux with it.

What numbers are you looking for with each reading or is it depending on what stage you in? I really want to learn how to dial my light in.

growsince79 · Feb 1, 2022

Dothraki said:
Anyone have experience with using Lux readings with LEDs? I’ve been having issues that look like light stress, but according to the Photone app I’m only at 30,000 Lux. I’m 6 weeks of flower tomorrow and 30,000 Lux seems to be stressing them. 2 plants under different lights but both around 30,000 Lux @ 6 weeks flower

Plant 1. Cupped leaves, yellowing, fox tailed bud.
View attachment 1212658

Plant 2 Losing color in bud leaves, veins still green.
View attachment 1212661 View attachment 1212662

Whats the temp and rh?

growsince79 · Feb 1, 2022

Dothraki said:
Anyone have experience with using Lux readings with LEDs? I’ve been having issues that look like light stress, but according to the Photone app I’m only at 30,000 Lux. I’m 6 weeks of flower tomorrow and 30,000 Lux seems to be stressing them. 2 plants under different lights but both around 30,000 Lux @ 6 weeks flower

Plant 1. Cupped leaves, yellowing, fox tailed bud.
View attachment 1212658

Plant 2 Losing color in bud leaves, veins still green.
View attachment 1212661 View attachment 1212662

Check runoff ppm and ph.

Dothraki · Feb 1, 2022

growsince79 said:
Whats the temp and rh?

Daytime 76-82f (82 at the canopy due to light, 76 on floor) 50% RH
Night 71f 45% humidity

freezeland2 · Feb 1, 2022

SofaKingHigh said:
What numbers are you looking for with each reading or is it depending on what stage you in? I really want to learn how to dial my light in.

When I measured this morning I was 20,000 lux, I believe DLI was like 23 ona 18hr cycle, and ppfd was 380. I’ll be posting pics of plants in morning with my weekly journal update.

Dothraki · Feb 1, 2022

SofaKingHigh said:
What numbers are you looking for with each reading or is it depending on what stage you in? I really want to learn how to dial my light in.

It’s different for each stage. The app probably isn’t accurate but I think it’s close enough to get an idea. But no sense after seeing what 30,000 lux is doing when the entire internet world says 50,000-80,000. So much misinformation out there. Funny how something as simple as growing cannabis seems to all be trial and error. Nobody can ever come up with straight answers.

SofaKingHigh · Feb 1, 2022

freezeland2 said:
When I measured this morning I was 20,000 lux, I believe DLI was like 23 ona 18hr cycle, and ppfd was 380. I’ll be posting pics of plants in morning with my weekly journal update.

Nice I’ll check it out.

Dothraki · Feb 1, 2022

freezeland2 said:
When I measured this morning I was 20,000 lux, I believe DLI was like 23 ona 18hr cycle, and ppfd was 380. I’ll be posting pics of plants in morning with my weekly journal update.

Ohhhh....you’re plants are 5 weeks from sprout. 20,000 seems right. I’m 6 weeks into flower and getting light stress from 30,000

freezeland2 · Feb 1, 2022

I’ll share a pic now. Here they are at 5 1/2 weeks. Nice flat leaves. They are under an HLG Scorpion Rspec light.

Dothraki · Feb 1, 2022

growsince79 said:
Check runoff ppm and ph.

You can’t check PH with the nutes I’m using, but it’s between 5.8-6.2 according to the shady characters that created it. Not sure if PPM can be checked either, due to the buffer. But doesn’t that look exactly what light stress is?

SofaKingHigh · Feb 1, 2022

Dothraki said:
It’s different for each stage. The app probably isn’t accurate but I think it’s close enough to get an idea. But no sense after seeing what 30,000 lux is doing when the entire internet world says 50,000-80,000. So much misinformation out there. Funny how something as simple as growing cannabis seems to all be trial and error. Nobody can ever come up with straight answers.

You have to do so much research just to find no consensus lol I will say each meter will read different but I’m good using the app to at least give me readings to work with. I’m trying to keep the 2 lights I’m running pretty close in numbers from the app.

growsince79 · Feb 1, 2022

Dothraki said:
It’s different for each stage. The app probably isn’t accurate but I think it’s close enough to get an idea. But no sense after seeing what 30,000 lux is doing when the entire internet world says 50,000-80,000. So much misinformation out there. Funny how something as simple as growing cannabis seems to all be trial and error. Nobody can ever come up with straight answers.

The trick is to learn the light without using the meter. Once the distance is right, then see what the meter says if you want. Every meter is so different you cant go by someone else's recommendations. I'm glad my lights don't have a dimmer... Sounds too confusing for me.

Photone App, LUX, Light Stress

Photone App, LUX, Light Stress

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