Do these look stressed any advice welcome thankyou..

[RoadKillSkunkHunt]

Don't put temp and rh meters under lights unless they are fully shaded.

It's a meter for reading air not light, light will heat it up give you false readings and then you incorrectly set the wrong environment which is 90% of everything.

Weird how this is general knowledge in all other disciplines and we seem to have very little advice. The met office would disown you for this behaviour they use a screen to protect all their Rh and temp equipment from light and so should we.

Generally your tent air temp and rh should track your room readings and once you know that it's easier to not measure inside the tent and many of us work that way round.

Hope that helps get your environment set. Getting a reading in a small hyper reflective tent is very hard it's almost better not to try.

A PPFD meter measures light. He's talking about measuring light, not air. While I do agree in principle about what you're saying ... he's trying to measure light so he does not want the meter shaded!

 

[BearWater]

It's a meter for reading air not light, light will heat it up give you false readings and then you incorrectly set the wrong environment which is 90% of everything.

This is something I’ve been questioning : ) if the heat is in the room with the plants then wouldn’t that just be the reading the plants are getting? If that makes sense lol. My outdoor grow has a little thermometer thing that sits by the plants on the ground. I had temps reading 130 degrees as the sensor was getting blasted by the sun, my plants are getting that same sun exposure, are they getting 130 degrees?

Trying to make sense out of it. Im sure I’m missing something here lol.

 

[RoadKillSkunkHunt]

I'm getting readings of around 410 ppfd u think that a bit high?.there 2 weeks old now...the lights are at 21 inches...that app seems to work great thanx..

If you're running CO2, you'd be right on. Since you're not, lower it just a bit. around 350 ppfd is probably a better setting for a 2 week old vegging plant.

 

[RoadKillSkunkHunt]

This is something I’ve been questioning : ) if the heat is in the room with the plants then wouldn’t that just be the reading the plants are getting? If that makes sense lol. My outdoor grow has a little thermometer thing that sits by the plants on the ground. I had temps reading 130 degrees as the sensor was getting blasted by the sun, my plants are getting that same sun exposure, are they getting 130 degrees?

Trying to make sense out of it. Im sure I’m missing something here lol.

I hang my sensor so its at canopy level. If my light were shining directly on it, it might impact the reading. However since the actual sensor is on the bottom underneath the sensor wire, its very difficult to position your sensor in a way where your light 18-20" above would have meaningful influence on it.

However, in the op's case, he's trying to dial in his lighting so yes, he wants the light directly shining on the phone so his photone app can read it.

 

[KG1]

This is something I’ve been questioning : ) if the heat is in the room with the plants then wouldn’t that just be the reading the plants are getting? If that makes sense lol. My outdoor grow has a little thermometer thing that sits by the plants on the ground. I had temps reading 130 degrees as the sensor was getting blasted by the sun, my plants are getting that same sun exposure, are they getting 130 degrees?

Trying to make sense out of it. Im sure I’m missing something here lol.

Heat....? Very vague term, let's physics that up to RADIATION CONDUCTION AND CONVECTION.

Have you googled why the met office don't put thermometers in direct light yet.

Should give a concrete answer to why we shouldn't either and the pitfalls of trying to set your environment based of a thermometer in the light.

Love to convince some canna companies to put the information in the box when they sell these temp sensors and rh probes, maybe when they care about growing not just making money.

Quote me if you still struggling for an explanation I'll try simplify the physics.

 

[RoadKillSkunkHunt]

Heat....? Very vague term, let's physics that up to RADIATION CONDUCTION AND CONVECTION.

Have you googled why the met office don't put thermometers in direct light yet.

Should give a concrete answer to why we shouldn't either and the pitfalls of trying to set your environment based of a thermometer in the light.

Love to convince some canna companies to put the information in the box when they sell these temp sensors and rh probes, maybe when they care about growing not just making money.

Quote me if you still struggling for an explanation I'll try simplify the physics.

How many times do I have to repeat myself ... the OP is trying to measure PPFD ... a light intensity setting. He very much wants the light shining directly on it for an accurate reading.

However, at 20" distance between the sensor and the light with the sensor pointing down towards the plants and not the light, you're over-reacting. At that distance, an LED light is not going to have a tremendous impact directly on that sensor for temperature and rH readings. Its a safe distance for measuring the environment of the plants at canopy level.

 

[BearWater]

Heat....? Very vague term, let's physics that up to RADIATION CONDUCTION AND CONVECTION.

Have you googled why the met office don't put thermometers in direct light yet.

Should give a concrete answer to why we shouldn't either and the pitfalls of trying to set your environment based of a thermometer in the light.

Love to convince some canna companies to put the information in the box when they sell these temp sensors and rh probes, maybe when they care about growing not just making money.

Quote me if you still struggling for an explanation I'll try simplify the physics.

yeah that was a vague usage : ) thanks for the break down. I havent googled why you wouldn’t put a thermometer directly in path of sunlight but have seen mine reach temps while the sun was shining on it so i totally understand what you are saying there. : )

Appreciate the food for thought!

 

[BearWater]

How many times do I have to repeat myself ... the OP is trying to measure PPFD ... a light intensity setting. He very much wants the light shining directly on it for an accurate reading.

However, at 20" distance between the sensor and the light with the sensor pointing down towards the plants and not the light, you're over-reacting. At that distance, an LED light is not going to have a tremendous impact directly on that sensor for temperature and rH readings. Its a safe distance for measuring the environment of the plants at canopy level.

It’s all good brother : ) he was answering my question. I probably shouldn’t have asked it on ops thread : / thats my bad. : )

 

[KG1]

How many times do I have to repeat myself ... the OP is trying to measure PPFD ... a light intensity setting. He very much wants the light shining directly on it for an accurate reading.

However, at 20" distance between the sensor and the light with the sensor pointing down towards the plants and not the light, you're over-reacting. At that distance, an LED light is not going to have a tremendous impact directly on that sensor for temperature and rH readings. Its a safe distance for measuring the environment of the plants at canopy level.

Someone put a thermometer in the sun and it reads 130 degrees and your saying that's correct...

My canopy has air rushing through it, in fact my small tent garners 200 cubic feet a minute....

I'll say no more, whatever you think is best but the science is out there for people who want to understand why I and others and the met office cringe at people who put probes to read only air under sources of intense radiation

 

[RoadKillSkunkHunt]

Someone put a thermometer in the sun and it reads 130 degrees and your saying that's correct...

My canopy has air rushing through it, in fact my small tent garners 200 cubic feet a minute....

I'll say no more, whatever you think is best but the science is out there for people who want to understand why I and others and the met office cringe at people who put probes to read only air under sources of intense radiation

You've got the wrong picture in your mind if you believe my readings are being overly influenced by my sensor positioning. It's not the science. It's the picture you have of the setup that is incorrect.

 

[KG1]

You've got the wrong picture in your mind if you believe my readings are being overly influenced by my sensor positioning. It's not the science. It's the picture you have of the setup that is incorrect.

Why are you arguing with me, the only picture is that if you put a thermometer in radiation it reads that over the air temperature.

I can't do science differently and the met office agrees.

end of please!

 

[RoadKillSkunkHunt]

Why are you arguing with me, the only picture is that if you put a thermometer in radiation it reads that over the air temperature.

I can't do science differently and the met office agrees.

end of please!

I don't care what AI agrees with you. It's not the science that is wrong. It's this idea that we have our sensors positioned in the wrong place. I assure you @BearWater and I do not have them positioned incorrectly. End of discussion on that.

To be quite frank with you, the OP was talking about lighting. Specifically how much is too much at his young plants age. We were discussing PPFD when you crashed the thread with unsolicited information we weren't even discussing. That's what got me. If you can contribute on topic, please do but don't start with this attitude. It ruins the whole discussion.

 

[craigsy]

I would use the photone app and your eyes to determine what intensity levels to run your lights at. Every grow is different. Every strain is different. Even every plant of the same strain has different responses. Your concept of increasing intensity is sound. I would encourage you to use all your tools (your eyes being one of the best ones) over a preconceived notion of what enough light is. Your 720 watt fixture is a powerhouse and its very easy to run your intensity too high with that light. (The extra power is a positive but that doesn't mean your goal should be to run the light at full power.)

For your approach, it would work best giving your plants extra room between the light and the canopy each time you raise intensity. This allows the plant to adjust by growing into the light. You'll have a lot less issues with light burn that way.

Hi I've highered my lights to 30 inches at 250 w..I'm still getting curled leaves and noticed some yellow on new growth...any ideas mate..my soil is bio bizz all mix I haven't added any nutes..they are nearly 3 weeks old now .

 

[NorthernShinobi]

Hiya..I'm only watering around the base of the plant you think I should water the whole pot..15 ltr..cheers mate

Just my opinion but bottom watering seedlings seems like a great way to not get water to your plants. Not enough roots development yet.
I would top water and encourage root dev by progressively expanding the diameter of the watering zone.

 

[craigsy]

Just my opinion but bottom watering seedlings seems like a great way to not get water to your plants. Not enough roots development yet.
I would top water and encourage root dev by progressively expanding the diameter of the watering zone.

Thanx..I have been doing this but today I have wet the whole media as there 3 weeks old ..hope this is the best thing to do..did you have a look at the vid I posted did you see some yellow on new growth ..thanx again

 

[NorthernShinobi]

Thanx..I have been doing this but today I have wet the whole media as there 3 weeks old ..hope this is the best thing to do..did you have a look at the vid I posted did you see some yellow on new growth ..thanx again

I did but it’s hard to tell.
Another poster suggested that it’s just a slightly hot soil causing some minor burn.
I’ve had that happen and it goes away as the plant grows.
You might be overwatering, my plants will sometimes look like that but you would normally see more leaf droop if you were.
They’re probably fine. Could just be that the growth is outstripping the plants root system and is stealing nutes from leaves to supply the growth.
I’d say just relax, maybe skip watering for a day or two over the next couple of weeks.
Caveat, I’m possibly the laziest grower ever and have never been stressed out over completely dialing in my grow.

 

[craigsy]

I did but it’s hard to tell.
Another poster suggested that it’s just a slightly hot soil causing some minor burn.
I’ve had that happen and it goes away as the plant grows.
You might be overwatering, my plants will sometimes look like that but you would normally see more leaf droop if you were.
They’re probably fine. Could just be that the growth is outstripping the plants root system and is stealing nutes from leaves to supply the growth.
I’d say just relax, maybe skip watering for a day or two over the next couple of weeks.
Caveat, I’m possibly the laziest grower ever and have never been stressed out over completely dialing in my grow.

Cheers..and they look amazing nice one

 

[craigsy]

Theses green gelato auto are 3 and a half weeks old now they started showing pre flower at 3 weeks..should I start bloom nutrients or wait a bit...they in bio bizz all mix soil..haven't fed anything yet thanx

 

[TannedViking]

Biobizz all mix has about 4 weeks of nutes. Best thing to do is use a ppm meter on your runoff next time you water. If it's still over 1000 or something measure again next time you water. If you dont have one, just wait until the runoff water starts looking clear. Either way, start of week 4 is your best bet to start bloom nutes. If you get to measure two waterings you also got a good idea of what she uses in between feeds.