I dont have a PAR chart. Where do i get it?
I really appreciate the help. I had it all calibrated wrong.
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Normally from your manufacturer directly. Or see if someone has mapped out your specific light. With HLGs im sure someone may have on here, google, or YouTube. Maybe search par map for hlg(model). Couldnât remember what light you had
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I did see a guy on YouTube that measured out the HLG 300L Respec and thats where i compared my number to. He had his set at 24" and took a bunch of readings 670 ppfd was the average. It matched up with the spec sheet i have for the light also. So i used that number input for the app and calibrated it.
Could i have gotten it right?
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Itâs probably off if you are using the average reading he got as that is for the whole area. If you could see what his highest # was at 24in then that would be your number.
Place your phone at 24" find the center point than calibrate and input that highest # he had at 24". Photon app does say it calibrates easier at 12" compared to 18 or 24. But even at 24" you should be a lot better off than nothing
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Thank you⌠this has been a frustrating day so farâŚLOL
I think the 670 was his highest number. I just said average off the top of my head. Everything seems within expected ranges when i put the app under the light. But, i am sure its off a little.
I am wondering about the factory calibration and if its accurate because its reading the same as my custom calibration, +/- a couple 10ths.
I am also using the Sunlight setting and calibrate using the sunlight setting because i hear its more accurate?
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Still have them on the kids doorway from when they were growing up!
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The sunlight setting is the one you want to use, yes.
If the calibration is only off by a little, then maybe the update was good. Iâve also seen it in other places to be accurate with no calibration.
Also, that gives you extra comfort knowing its accurate
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Thanks, yes⌠i was sweating it⌠i still am a little. I just dont want my lights to close or too much DLI and heat. I am starting the 5th week of flower tomorrow and i feel the lighting is critical at this stage. Is there even truth behind âToo much lightâ? Or is it the heat that can destroy turpines/potency?
What could happen if theres too much light?
I already can figure out if theres not enough but, i have never heard of too much light can be bad unless its heat related, right? Or am i off base here?
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Yes, i just used the search bar. Too much light is no good. Off to the study room i go. Much to learn and more experience combined will get me over thisâŚ
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I have burned a few leaves and flowers having my.lights up high. 4500 runs about 75percent and the 650R is at 60 keeps heat down also, you shouldnt feel your skin bubble when your under your lights, just saying
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I ran some Black Jack in my first grow alongside some Banana Kush plants at a peak of 750 watts. I grew out some cuttings taken from that Black Jack plant next grow and probably maxed the wattage draw at 600 watts on that one. The Banana Kush loved the extra light, but not the Black Jack, it did much better next go round with less light. I am still a novice at this but I think the only real difference on my grows was the amount of light. I think every strain, and every pheno behaves a little different.
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I want tight solid buds but not at the expense of destroying the terpenes profile or burning the buds up. I am running at 45 - 50 DLI at the tops of the tallest buds but the lower ones only get about 30 -35 DLI. I am noticing hot spots also, where the DLI shoots up to 55 - 60 DLI in places. Im watching how the leaves behave.
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Hola @anon34311147 rememberâŚthe leaves perform the photosynthesisâŚnot the budsâŚother than tiny bud leaves.
My grow health greatly improved when I changed my pruning habits to leave larger leaves throughout the growâŚunless airflow or thereâs a shading issue.
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This 
Flower calyxes (buds) are only 5% as efficient at photosynthesis as leaves are. Buds donât need or really use light. The leaves conduct photosynthesis and the resulting nutrients (sugars) are transported where they are needed in the plant via the stem system.
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Thatâs why I have the option to add more readings inputs on my dli appâŚit averages the DLI. That way I can keep my numbers under better control.
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@Growmoredank @MidwestGuy
So should i be guaging the DLI from the area the most leaves are at and not from the tops of the buds?
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DLI should be measured at the canopy of the plant.
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Which is near the tops. Correct?
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Correct
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