Lumens/Lux/Light!

[Sparrow707]

Does anyone have a good knowledge on greenhouse light intensity? I have a rigid house with fiberglass paneling, some new some old.
My light meter measures in klux and from what I've read I think 50,000 lux is optimal for cannabis growth? Under the new paneling I get a reading of 41,000 lux and other places around the older paneling reads between 27 and 30 klux.
The light penetrating the older panels is still intense but my question is - is the lux/weight ratio going to be worth replacing the panels?
If anyone has a light meter I'd love to know what kind of intensity you guys are getting in your houses.

Thanks!

 

[egodeath]

Does anyone have a good knowledge on greenhouse light intensity? I have a rigid house with fiberglass paneling, some new some old.
My light meter measures in klux and from what I've read I think 50,000 lux is optimal for cannabis growth? Under the new paneling I get a reading of 41,000 lux and other places around the older paneling reads between 27 and 30 klux.
The light penetrating the older panels is still intense but my question is - is the lux/weight ratio going to be worth replacing the panels?
If anyone has a light meter I'd love to know what kind of intensity you guys are getting in your houses.

Thanks!

"The intensity of light is important for maximizing the rate of photosynthesis. The optimal light level for photosynthesis is 10,000 lux. Lux is a unit for measuring light intensity. Low light intensity lowers the rate of photosynthesis. However, after reaching an intensity of 10,000 lux, there is no increase in the rate. The rate of photosynthesis may in fact be lowered as chlorophyll is bleached from the chloroplast and the plant’s stomas are closed to slow down water lost through respiration."

Thats a fact. No discussion needed.

 

[Aphotic]

"The intensity of light is important for maximizing the rate of photosynthesis. The optimal light level for photosynthesis is 10,000 lux. Lux is a unit for measuring light intensity. Low light intensity lowers the rate of photosynthesis. However, after reaching an intensity of 10,000 lux, there is no increase in the rate. The rate of photosynthesis may in fact be lowered as chlorophyll is bleached from the chloroplast and the plant’s stomas are closed to slow down water lost through respiration."

Thats a fact. No discussion needed.

10,000 lux is going to generate some sad sparce crops, more like 30,000-50,000 depending on variety grown. 10,000 is the minimum light required for healthy but sparse growth.

 

[Aphotic]

Does anyone have a good knowledge on greenhouse light intensity? I have a rigid house with fiberglass paneling, some new some old.
My light meter measures in klux and from what I've read I think 50,000 lux is optimal for cannabis growth? Under the new paneling I get a reading of 41,000 lux and other places around the older paneling reads between 27 and 30 klux.
The light penetrating the older panels is still intense but my question is - is the lux/weight ratio going to be worth replacing the panels?
If anyone has a light meter I'd love to know what kind of intensity you guys are getting in your houses.

Thanks!

How old are your panels? How many years do you think they haveeft in them? Panels are pretty expensive, your old panels will still yield healthy happy plants. Do you use a shadecloth in the summer? What are your summer time temps in the greenhouse? Do you have automated climate control? Here in Oregon I have to rock a shadecloth in the summer, even with adequate ventilation, I do own and use a light meter, but I've never taken readings in my inhibitor, x, however my plants do just fine, and my shadecloth blocks 25% of incoming light. On the next sunny day I'll take my meter out there and take a reading. Indoors I get better results with a higher lux due to the differences in the ability of the light to penetrate.

There are benefits and drawbacks to growing in a greenhouse, I won't get into the benefits as I think most of them are obvious. Some things to consider, depending on where you live, heat can become an issue, the greenhouse panels and plastic have have a UV inhibitor, UV light has been linked to a higher resin production, and pests are more of an issue in a greenhouse invironment. I like growing in hoop houses, where I can keep the greenhouse plastic off, until its needed.

 

[TnTLabs]

if you want to do it properly, then you need to check PAR or μmol
Micromole:
per second and square meter (μmol m-2 s-1). This term is based on the number of photons in a certain waveband incident per unit time (s) on a unit area (m2) divided by the Avogadro constant (6.022 x 1023 mol-1). It is used commonly to describe PAR in the 400-700 nm waveband.
For us humans Lumen & Lux might be a rough guide but for plants its not important
the PAR Value discribes how much light the plants can make use of

 

[egodeath]

well i guess aliens always come, put me in a coma, steal my plants, put them under at least 50000 lux or calculate the PAR times mol and what the fuck and keep it really complicated to show off, bring them back, wake me up, do this everyday for many years now and let me think that the knowledge being taught for professional gardeners is correct when in fact it is just a scam to let me think I can do miracles and let me live in a fantasy world... now that you say it ...

If someone wants to throw money, energy, ressources etc. out of the window because of his bloated ego or the marketing scam to make people and companies rich who sell lighting, electricity, nutrients, equipment for growing, he can do so.
Sucker do as sucker think, I left the club some time ago, but thats a personal choice...

 

[Aphotic]

well i guess aliens always come, put me in a coma, steal my plants, put them under at least 50000 lux or calculate the PAR times mol and what the fuck and keep it really complicated to show off, bring them back, wake me up, do this everyday for many years now and let me think that the knowledge being taught for professional gardeners is correct when in fact it is just a scam to let me think I can do miracles and let me live in a fantasy world... now that you say it ...

If someone wants to throw money, energy, ressources etc. out of the window because of his bloated ego or the marketing scam to make people and companies rich who sell lighting, electricity, nutrients, equipment for growing, he can do so.
Sucker do as sucker think, I left the club some time ago, but thats a personal choice...

I wasn't trying to poop on your parade or anything, I just had a difference of opinion, maybe I have bad info, or maybe my light meter sucks. I go by my experience, I guess yours differs.

 

[egodeath]

sorry too if i was a bit harsh, i get a bit annoyed sometimes because i have read so much bs and sometimes just cant take it anymore.

everyone in our society and culture gets so twisted ideas about "reality" (myself included of course) it is very sad.
i also once believed a lot of lies and wrong ideas and "truths" that are presented as if true but in reality, not in the fantasy world we sadly live in, they are just a bunch of lies, justifications, rationalizations, fabrications, thoughts, phrases etc.

i cant get into it here expecially not in a few words and a few minutes it takes a long time to understand just a small part of what is going on. and i am sure the small part i (at least sometimes) understand is such a small part it is laughable.

To give you another perspective on reality i can give you a bit of information about our planet.
earth was once almost completely full of trees. earth was a big forest with trees growing for thousands of years getting unbelievably big and immense in diameter.
When the europeans invaded america for example the continent was a big forest with trees from west to east, the people on the ships coming onto the east coast were apparently able to smell the scent of the flowering trees miles on sea.
europe the same story, it would be a big forest hadnt the inhabitants destroyed it for glas, steel, weapon manufacturing, steam engines and boats etc. all our so called progress.

most plants are adapted to forests not deserts, but what our culture, society is doing is producing a full sun environment, a desert to grow crops and we believe it is the right thing to do even though most plants do not need that much light exposure to grow.
if they would then nothing would grow in forests or in the shade or in places with less sun.
i have grown hemp in the shade under about 10000 lux, no problem.
when hemp grows outside it really likes cloudy days best and most plants (and cannabis is one of them) dont really like it too hot, around 24 degrees celsius is good maybe up to 28 or 30.

hps lights have a different spectrum than sunlight but nonetheless under hps 10-15 000 lux is enough for the nicest plants and buds if done correctly and not trying to imitate outside conditions, scrog or lst is best