# Interesting study on PPFD, DLI , C02, and what we know **URL:** \ **Category:** Lighting\ **Created:** [April 25, 2022, 3:52am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190 "2022-04-25T03:52:04Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![The\_Chef](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/the_chef/32/710105_2.png) [@The\_Chef](https://ilgmforum.com/u/The_Chef)\ **Post date:** [April 25, 2022, 3:52am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/1 "2022-04-25T03:52:04Z")
Stumbled upon this article , which I found very interesting and am still reading it and trying to understand it. From what I gather and what we know and follow may not be exactly correct. Supplemental C02 over 1000 ppfd may not be needed. Apparently it’s the leaf temps that exceed 86° Fahrenheit would require supplemental C02. I think the reason why 1000ppfd was the staple is because HPS were burning plants and it wasn’t because of the ppfd it was the heat from them. 🤷‍♂️ I may be wrong in what I’m reading and I’m really high right now😂 and am enthralled in this study. Some of you folks may be interested. Maybe not lol. I know @Nicky has his DLI thread based on pushing 60 DLI and comparing grows with less. He may be on to something that could possibly coincide with this study. Who knows. All of you may have already read it 😂 > **[Cannabis Yield, Potency, and Leaf Photosynthesis Respond Differently to...](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8144505/)** > > Since the recent legalization of medical and recreational use of cannabis (Cannabis sativa) in many regions worldwide, there has been high demand for research to improve yield and quality. With the paucity of scientific literature on the topic, this... @dbrn32 @Nicky @MeEasy @Flipdawg08 @Low @Tylersays @PurpNGold74 @Myfriendis410 ---
**Author:** ![Tylersays](https://avatars.discourse-cdn.com/v4/letter/t/b4bc9f/32.png) [@Tylersays](https://ilgmforum.com/u/Tylersays)\ **Post date:** [April 25, 2022, 4:06am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/2 "2022-04-25T04:06:58Z")
Thx @The_Chef definitely gonna be a interesting read. However, after a quick scan I realized - I’m either way to high right now - or not nearly high enough!! LOL! You know me man - I read it was all about the lights and took that shit to heart! ❤ 😆 😂 🤣 ---
**Author:** ![GreenSnek](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/greensnek/32/366307_2.png) [@GreenSnek](https://ilgmforum.com/u/GreenSnek)\ **Post date:** [April 25, 2022, 4:09am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/3 "2022-04-25T04:09:24Z")
I have light burned plants before but they have to be about 4 inches from the light, but the veg growth from center tent of 40-55 dli vs the edges of 35-45 is very noticable,( almost doubled) ---
**Author:** ![The\_Chef](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/the_chef/32/710105_2.png) [@The\_Chef](https://ilgmforum.com/u/The_Chef)\ **Post date:** [April 25, 2022, 4:11am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/4 "2022-04-25T04:11:36Z")
😂😂🤣 yeah I had to take a break bro. ---
**Author:** ![Tylersays](https://avatars.discourse-cdn.com/v4/letter/t/b4bc9f/32.png) [@Tylersays](https://ilgmforum.com/u/Tylersays)\ **Post date:** [April 25, 2022, 4:12am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/5 "2022-04-25T04:12:44Z")
It can be a deep, deep dive. 🤿 ---
**Author:** ![The\_Chef](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/the_chef/32/710105_2.png) [@The\_Chef](https://ilgmforum.com/u/The_Chef)\ **Post date:** [April 25, 2022, 4:14am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/6 "2022-04-25T04:14:54Z")
It’s deep man. I was good for a while. Went outside and cracked 3 or 4 hits and yeah. Had to take a break and it’s late af 🤣 ---
**Author:** ![Tylersays](https://avatars.discourse-cdn.com/v4/letter/t/b4bc9f/32.png) [@Tylersays](https://ilgmforum.com/u/Tylersays)\ **Post date:** [April 25, 2022, 4:18am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/7 "2022-04-25T04:18:03Z")
These guys are light makers mainly but they have a ton of articles and info on all kinds of lighting things. > **[LIGHT TREATMENTS: BOOSTING PLANTS WITH FAR RED](https://blog.heliospectra.com/light-treatments-boosting-plants-with-far-red)** > > Using Far-Red Light Treatments can offer many benefits such as growing large heavy Lettuces or decreasing the flowering time in Cannabis. Actually I think it’s the same company I posted over in @Flipdawg08 s journal. but different article…I think! LOL! ---
**Author:** ![The\_Chef](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/the_chef/32/710105_2.png) [@The\_Chef](https://ilgmforum.com/u/The_Chef)\ **Post date:** [April 25, 2022, 4:19am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/8 "2022-04-25T04:19:04Z")
Now I have more to read 🤣🤣🤣 ---
**Author:** ![The\_Chef](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/the_chef/32/710105_2.png) [@The\_Chef](https://ilgmforum.com/u/The_Chef)\ **Post date:** [April 25, 2022, 4:22am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/9 "2022-04-25T04:22:50Z")
Supposedly they pushed plants up to 2000ppfd and found that it wasn’t the intensity. It didn’t affect the saturation of light. It was when they went beyond the surface temps of 86° on the leaves that they had to supplement C02. I think 🤣 I know @dbrn32 will or has read it and will dumb it down for someone like me. ---
**Author:** ![DEEPDIVERDAVE](https://avatars.discourse-cdn.com/v4/letter/d/f05b48/32.png) [@DEEPDIVERDAVE](https://ilgmforum.com/u/DEEPDIVERDAVE)\ **Post date:** [April 25, 2022, 4:49am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/10 "2022-04-25T04:49:17Z")
YouTube videos with explanations for PPFD, PAR and DLI. ![CO2 REQUIRED](https://global.discourse-cdn.com/growingmarijuana/original/4X/4/2/7/427e71d6451791cb18f6a1eb902435e6eabf6218.png) ![Dr. Bruce Bugbee (USU) 9 Paramaters](https://global.discourse-cdn.com/growingmarijuana/original/4X/7/3/a/73a51cd0753f551237276d5fd1be9e09e1149576.jpeg) ![Yield and lights](https://global.discourse-cdn.com/growingmarijuana/original/4X/7/5/c/75c4bf8abb70430d0b4f2bc8f5fa23f573c7abb1.jpeg) ---
**Author:** ![Flipdawg08](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/flipdawg08/32/664260_2.png) [@Flipdawg08](https://ilgmforum.com/u/Flipdawg08)\ **Post date:** [April 25, 2022, 5:11am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/11 "2022-04-25T05:11:42Z")
@The_Chef @Tylersays I’m not even going to try reading or getting into that right now lmao way too twisted haha will def come back to this lol ---
**Author:** ![The\_Chef](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/the_chef/32/710105_2.png) [@The\_Chef](https://ilgmforum.com/u/The_Chef)\ **Post date:** [April 25, 2022, 11:50am UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/12 "2022-04-25T11:50:55Z")
We’ve all read that. Bugbee is the man! This new study was just released a few weeks ago. ---
**Author:** ![The\_Chef](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/the_chef/32/710105_2.png) [@The\_Chef](https://ilgmforum.com/u/The_Chef)\ **Post date:** [April 25, 2022, 2:02pm UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/13 "2022-04-25T14:02:32Z")
Yeah my head was hurting the further I went 😂 I’ll probably look at it again after work today lol ---
**Author:** ![dbrn32](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/dbrn32/32/533801_2.png) [@dbrn32](https://ilgmforum.com/u/dbrn32)\ **Post date:** [April 25, 2022, 3:39pm UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/14 "2022-04-25T15:39:59Z")
Seems like a reasonable study. I would have liked more detailed explanation on why there was so much variance in weight of their sample plants. ---
**Author:** ![pr](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/pr/32/529753_2.png) [@pr](https://ilgmforum.com/u/pr)\ **Post date:** [April 29, 2022, 9:18pm UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/15 "2022-04-29T21:18:35Z")
Good read there. ---
**Author:** ![kylieavery95](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/kylieavery95/32/720634_2.png) [@kylieavery95](https://ilgmforum.com/u/kylieavery95)\ **Post date:** [June 13, 2022, 4:27pm UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/16 "2022-06-13T16:27:40Z")
Interesting study, I never thought about it. I’m new to this and just learning. I spend more time studying in college. A year ago I found a samples collection, I use [https://studydriver.com/](https://studydriver.com/) for this. For me, this is a big relief. Because you don’t need to invent something yourself, I just redo it. I’ll be fully immersed in this topic soon. ---
**Author:** ![PhotoFinisH](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/photofinish/32/709710_2.png) [@PhotoFinisH](https://ilgmforum.com/u/PhotoFinisH)\ **Post date:** [June 22, 2022, 7:50pm UTC](https://ilgmforum.com/t/interesting-study-on-ppfd-dli-c02-and-what-we-know/86190/17 "2022-06-22T19:50:36Z")
> [@The\_Chef](#): > > Apparently it’s the leaf temps that exceed 86° Fahrenheit would require supplemental C02. > [@The\_Chef](#): > > Supposedly they pushed plants up to 2000ppfd and found that it wasn’t the intensity. It didn’t affect the saturation of light. It was when they went beyond the surface temps of 86° on the leaves that they had to supplement C02. I’ve read the first link at least four or five times already, & I don’t see where they talk about monitoring leaf temperatures, or enriching their CO2 levels, at least not beyond 400ppm. Am I missing it? " Canopy-level air temperature, relative humidity (RH), and carbon dioxide (CO2) concentration were monitored on 600-s intervals throughout the trial with a logger (Green Eye model 7788; AZ Instrument Corporation, Taiwan). The air temperature, RH, and CO2 concentrations were (mean ± SD) 25.3 ± 0.4°C, 60.5 ± 4.8%, and 437 ± 39 ppm during the day (i.e., lights on) and 25.2 ± 0.3°C, 53.1 ± 3.3%, and 479 ± 42 ppm during the night. " Either way, there seems to be other evidence in that link to pour on the photons.