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Mercury
WHO fact sheet on mercury and health: includes key facts, definitions, exposure, health effects, measures to reduce exposure, WHO response.
Mercury is dangerous. Like for real.
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LED and BUD QUALITY
- Thread starter Tropical Sun
- Start date
Mercury is dangerous. Like for real.
This article also helped me understand a lot about Temp differences and how plants respond to a light.
inspire.ag
Plants grown under LED fixtures are exposed to virtually zero direct infrared radiation, which is a novel experience compared to the conditions they are typically accustomed to in nature. HPS lamps emit quite a bit of infrared radiation, which is why they get so hot and why you can feel a warming effect when you are underneath them. As mentioned in our first article in this series, infrared will heat the water inside of a plant, causing it to transpire at a faster rate due to the intense warming effect on the vapor in the leaves. However, HPS lamps do not emit much blue light (around 3%), which is what separates them from sunlight and LED fixtures. Blue light induces stomatal opening in the plant. Sunlight emits a large amount of infrared, but the huge quantity of blue light signals the plants to stay cool. We could say that because HPS lamps lack this light fraction, the temperature in most grow rooms needs to be kept milder at around 24-25°C (75-77°F) to account for an increased thermal load from the lamp and a decreased signaling capacity. The temperature of the canopy is far more important than the temperature of the air, particularly when the lights are on.
LEDs have a high fraction of blue light, which induces stomata to stay open. However, since this is paired with almost zero infrared, the plants stay very cool and room temperature needs to be kept much higher at 27-30°C (80-86°F). To make things even more complex, green light reverses the stomatal opening effect of blue light. More research is needed in order for us to fully understand how this impacts transpiration directly and how this differs in the presence of infrared light, but it certainly seems that this is a contributing factor to the temperature tolerance differences we see in HPS and LED grow rooms.
InSpire Blog | Does Light Spectrum Alter Plant Transpiration Rates?
Disclaimer: This article originally appeared in the September 2021 issue of Cannabis Science & Technology.
inspire.ag
Plants grown under LED fixtures are exposed to virtually zero direct infrared radiation, which is a novel experience compared to the conditions they are typically accustomed to in nature. HPS lamps emit quite a bit of infrared radiation, which is why they get so hot and why you can feel a warming effect when you are underneath them. As mentioned in our first article in this series, infrared will heat the water inside of a plant, causing it to transpire at a faster rate due to the intense warming effect on the vapor in the leaves. However, HPS lamps do not emit much blue light (around 3%), which is what separates them from sunlight and LED fixtures. Blue light induces stomatal opening in the plant. Sunlight emits a large amount of infrared, but the huge quantity of blue light signals the plants to stay cool. We could say that because HPS lamps lack this light fraction, the temperature in most grow rooms needs to be kept milder at around 24-25°C (75-77°F) to account for an increased thermal load from the lamp and a decreased signaling capacity. The temperature of the canopy is far more important than the temperature of the air, particularly when the lights are on.
LEDs have a high fraction of blue light, which induces stomata to stay open. However, since this is paired with almost zero infrared, the plants stay very cool and room temperature needs to be kept much higher at 27-30°C (80-86°F). To make things even more complex, green light reverses the stomatal opening effect of blue light. More research is needed in order for us to fully understand how this impacts transpiration directly and how this differs in the presence of infrared light, but it certainly seems that this is a contributing factor to the temperature tolerance differences we see in HPS and LED grow rooms.
CannaT
starin' at the world through my rearview
Leds are only good if you have air cooled room with warm air from outside.
And they are best if you have sealed setup.
In all other setups hids will give you better quality.
With leds and hids you can grow great flowers.
Just you need to know how.
And they are best if you have sealed setup.
In all other setups hids will give you better quality.
With leds and hids you can grow great flowers.
Just you need to know how.
u can't see proof... u gotta smoke it..... and i'm not saying led is better then cmh, or vice versa... or better then mh/hps.... etc
the pictures posted look outrageous... so much better then my shitty grows, but the proof is always in the smoke...
If you see flowers with only stalks they do not grow that way. Poor handling or the heads removed is the cause. The quality of the high is what matters. Very frosty weed doesn't always make quality cannabis. The cannabinoid makeup is what produces the best high. Still, people buy their weed based on looks. I don't see that changing anytime soon.
Reply
I rarely see frost on weed at dispensaries. They tumble the buds, and shake all the good shit off before they package it to sell. Then they take all that good shit, and sell it to us, I don't know in what form, concentrates, I suppose. Free the Frost! But not from the buds!
JumpinJimmy
Member
Bro I keep reading your comments and this issue is your smoking dispensary bud which is always gonna be premature. It’s sucks. It’s not the led. It’s their early harvest habits man. Early bud sucks no matter what you grow it under
Ca++
Well-known member
Lol, keep repeating what you heard in the news brother, another brainwashed sheep, what's new ?
No, it's not, if you relay on WHO to tell you what dangerous or not you need your brain inspected, really ,I feel like I'm talking to 6 year olds with no education, I bet u got your covid shots also right ?Mercury
WHO fact sheet on mercury and health: includes key facts, definitions, exposure, health effects, measures to reduce exposure, WHO response.www.who.int
Mercury is dangerous. Like for real.
I don't buy dispo weed what are you joking
I have a medical card and used to have the most insane med weed, it was outdoor grown and was better smoke then anything on the market now, yes, even your market.
That was years ago, since 2019 the med weed has become so low in quality it's insane
So I switched to home growers, people who had the dank for years, but they had even worse quality !
Sorry people, I still can't believe you get better smoke under LEDs, I just didn't smoke anything like you describe, maybe in time...
But I really doubt that as for now cuz I smoked too much of it to know to stay away from it and not take people who describe it like it's da bomb.. heard that too many times before.
i love a stalk brother Koondense heres the SAME Bud Sample 3 days later will be getting chopped monday or tuesday after todays scoping stay safe guys .
Niigata Minamata disease victims shed light on stigma in new book
The perils of mercury-poisoning are laid bare by victims of the Niigata Minamata disease who recount lingering social stigma and the importance of protecti
www.japantimes.co.jp
Corpselover Fat
Active member
smirnoff420
Well-known member
It's great for cannabis plants too. I always give a couple of tablespoons into the soil. It will accumulate in the leaves and reflect more light there which increases photosynthesis. But only with HPS lights.
