Light problem?

Hello everybody,

I've just setup a new grow space with a flexstar 645w pro which is 60cm away from plant tops on 40% setting.

Environment and pH are all good but my girls aren't happy. Blueberry is unhappier than the orange bud but none of them are looking great.

I've had this same problem when I first put the plants in and had my light closer, after moving my light further away, the problem corrected... The plants have since grown but I've maintained distance of 60cm from plant tops but the problem is coming back.

I know there is so much knowledge here and I'm hoping your can point me in the right direction to fix cause they are of the size now where I need to flip to flower.

Thank you all in advance for any feedback you have.

[Edit: I have just switched soil and didn't read the specs on it (duh). I'm now realising that the soil would be considered quite hot with 1.5-1.8ec.

And then a week after I tried giving them some fermented fruit juice (I should have laid off but it smelled so good lol).

My new question is: could this be over feeding? I'm seeing since slightly burned tips, but the speckled leaves? Could that be a possibility?

Dial your power back. They don’t need much light in veg. Suggest buying a cheap quantum PAR meter. Mine was $150 and they’re still under $200. I have checked it side by side against an Apogee and the difference in readings would be acceptable in any scientific study. It’s my most used piece of gear. Answers all questions about power at a specific spot immediately. Plus it recharges with a USB.

hotrodharley said:

Dial your power back. They don’t need much light in veg. Suggest buying a cheap quantum PAR meter. Mine was $150 and they’re still under $200. I have checked it side by side against an Apogee and the difference in readings would be acceptable in any scientific study. It’s my most used piece of gear. Answers all questions about power at a specific spot immediately. Plus it recharges with a USB.

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It's already on its lowest setting so I can't dial this light down anymore

I need to get a par meter.

hatchi100 said:

It's already on its lowest setting so I can't dial this light down anymore

I need to get a par meter.

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My neighbor was having issues. 5 LED lights and none the same make. Went over and in an hour had lights adjusted and plants arranged. 2 days later he was amazed and ordered one.

hotrodharley said:

My neighbor was having issues. 5 LED lights and none the same make. Went over and in an hour had lights adjusted and plants arranged. 2 days later he was amazed and ordered one.

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I have a lux meter and in the corner where it's most affected is only 9800lux. Very low. Converts to only 147 ppfd which is right at the bottom end of what I understand you need during veg.

Do you think this could be a calmag issue or perhaps even too little light? I'm confused.

Thank you very much for taking the time to reply.

hatchi100 said:

I have a lux meter and in the corner where it's most affected is only 9800lux. Very low. Converts to only 147 ppfd which is right at the bottom end of what I understand you need during veg.

Do you think this could be a calmag issue or perhaps even too little light? I'm confused.

Thank you very much for taking the time to reply.

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Don’t think it’s calcium but if that’s close to an accurate reading you’re way under power so doubt it’s light related either.

hotrodharley said:

Don’t think it’s calcium but if that’s close to an accurate reading you’re way under power so doubt it’s light related either.

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Agreed, with those values I doubt very much. It's just the way the leaves are speckled it's throwing me off what it is.

I have changed soil and nutes on this grow and thought I'd taken special care not to over feed them. That said, have you ever seen these symptoms on a plant and over feeding is responsible?

I'm asking this cause this soil is quite hot and i did feed them after a week of going into their new pots. (That's not really special care come to think of it).

Even still though, with over feeding, the tips normally go burnt first right? Not as displayed in the pictures I posted.

Thoughts? Tia

Might it be an iron deficiency?
I dont think thats from too much light.
Here's a decent video on the Flexistar 645 pro. 7 minutes 40 seconds onwards on video.
Check out the distance he's hanging it and the par readings.
Hanging height 24" ~ 600mm at 40% on dimmer, looks perfect setting for veg.

Pretty sure when mine have looked like that in veg it's the onset of Mg deficiencies.

@hotrodharley is correct too. Get a lux or par meter.

hatchi100 said:

It's already on its lowest setting so I can't dial this light down anymore

I need to get a par meter.

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Raise the light then.

What's your light schedule and temps?

Definitely shouldn't be light issues. I run 45k lux from germination and never had any light stress issues. I'm currently at 51000 lux at day 16.

I have a few lux meters and rent an apogee from the hydro store when I first set up a new footprint. I've found the good old "lux multiplied by 0.017" to be within a few percent if you have an average spectrum.

It looks odd indeed. Like a mix of mag onset crossed with variagation. Hope you get it figured out.

VincenzioVonHook said:

Definitely shouldn't be light issues. I run 45k lux from germination and never had any light stress issues. I'm currently at 51000 lux at day 16.
View attachment 5219687
I have a few lux meters and rent an apogee from the hydro store when I first set up a new footprint. I've found the good old "lux multiplied by 0.017" to be within a few percent if you have an average spectrum.

It looks odd indeed. Like a mix of mag onset crossed with variagation. Hope you get it figured out.

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Yeah but what's your environment like?

If your running 20/4 and your temps are on point you'll get different results that someone running the same lighting on 24/0 and 8 degrees cooler.

When I switched to 12 hours day from 10 1/2 hours, I burned several plants and had to dial back my Boards. Accumulation of intense light over that time was burning them.

coreywebster said:

Yeah but what's your environment like?

If your running 20/4 and your temps are on point you'll get different results that someone running the same lighting on 24/0 and 8 degrees cooler.

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Environment has been touch and go. I've been at around 33-35c in the tent and around 25-30% humidity the last week or so. Before that roughly 28c/60% at birth. Summer came in quick. I ran 12/12 from seed to cut down on heat hence the high PAR to reach DLI.

Weed is incredible tolerant to high light intensity of the environment is anywhere near adequate. I go by DLI, and always go 35 DLI from the get go and move to 45 during flower, whether that's at 20hrs with autos or 12 hours with photos.

I just don't think this issue is related to intensity being too high.

GrowWeedEasy has the best “Plant Problem” section I’ve seen.

VincenzioVonHook said:

Environment has been touch and go. I've been at around 33-35c in the tent and around 25-30% humidity the last week or so. Before that roughly 28c/60% at birth. Summer came in quick. I ran 12/12 from seed to cut down on heat hence the high PAR to reach DLI.

Weed is incredible tolerant to high light intensity of the environment is anywhere near adequate. I go by DLI, and always go 35 DLI from the get go and move to 45 during flower, whether that's at 20hrs with autos or 12 hours with photos.

I just don't think this issue is related to intensity being too high.

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True about being high tolerance but not if it's too cold , that's when high light levels cause problems.

You could well be right and it's not light related.

But I wouldn't rule it out without knowing the OPs environmental factors.

coreywebster said:

Raise the light then.

What's your light schedule and temps?

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Lights are 24/7. Temp 26c. Humidity 60%.

coreywebster said:

Yeah but what's your environment like?

If your running 20/4 and your temps are on point you'll get different results that someone running the same lighting on 24/0 and 8 degrees cooler.

Click to expand...

Yes. 24/7. Temp 26c. Humidity 60%.

Moflow said:

Might it be an iron deficiency?
I dont think thats from too much light.
Here's a decent video on the Flexistar 645 pro. 7 minutes 40 seconds onwards on video.
Check out the distance he's hanging it and the par readings.
Hanging height 24" ~ 600mm at 40% on dimmer, looks perfect setting for veg.

Click to expand...

Thank you very much

Moflow said:

Might it be an iron deficiency?
I dont think thats from too much light.
Here's a decent video on the Flexistar 645 pro. 7 minutes 40 seconds onwards on video.
Check out the distance he's hanging it and the par readings.
Hanging height 24" ~ 600mm at 40% on dimmer, looks perfect setting for veg.

Click to expand...

Excellent video that. Thank you.