Having A Light Source Too Close

[DrPhoton]

Yes i believe even just a basic understanding in plant biology can go a long way in horticulture.
Very right on commercial growers fixture heights. Quite often they hang their lights several feet high, as they understand about light physics and how light does not degrade and why uniformity is very important. They quite often only measure around 500umols at canopy like you say, but they will yeild the best out of any other setup.

I was a few hours in and was clearly getting very tired, the last half of the article needs work to improve readability. But i will leave that to later. There are also standing issues with embedded images on this forum.

[Vapo69]

Dude .....great read.......can anyone explained VPD to me in layman's please?.....thanks

[Weed Pharma]

Thank you so much, for this information. Best article i've read in a very long time:
Whenever you do anything with cannabis- you must consider basic plant biology, which often is overlooked on many forums/posts.


I typically shoot for around 700umols at the canopy, but only use the companies PAR information chart.
The range you provided 500-1000 umols sheds light (pun intended) on why so many commercial growers have a PAR of around 510-525 umols at the soil or lowest leaf surface, keeping the entire plant in the zone.

The cure for so many grow problems- is to move the light away and watch the plant recover on it's own!

[D.A.A.S.69]

I hear you BlueBudz, I like things that make me think, but I ain't like you an Dano, y'all got something to think with, I didn't get none of that. lol. MerryChristmas
PS- I'm still trying to figure out how to use a damn lux meter.

[RosettaStoned]

Good read!

[D.A.A.S.69]

Yeah your right, damn near impossible to have everything right. Still what else you got but watching your plants as close as you can

[BlueBudz]

Great article! I have often had thoughts about this. Also another thing you could maybe add or talk about to help people with the correct distance would be the shadows of darkness having the light to close would create. Causing under growth to get less and top to get to much..
i love when things get me thinking.
Merry Christmas

[DrPhoton]

Yea reading your plants is very important. But one aspect that goes overlooked is that the point between the compensation point and photoinhibition, can go unnoticed. Because the plant wont always show signs. Typically the plant can have a lower quantum yeild from chlorophyll avoidance or non-photochemical quenching. External symptoms such as bleaching doesnt happen until photoinhibition has initiated and damage has happend.

Still lots of work to do though.

[D.A.A.S.69]

Hey Dano, that's a great article, but all of yours are great, an informative, way over my head ,but I still love reading them.
You can tell easily ,when the lights too close, an they damn sure don't like it to close either, if your watching your plants.

[DrPhoton]

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