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Myth busting part 3.1 Confirmed

John_Kramer
John_Kramerstarted grow question 5d ago
i did some experiments without jar and it seems that TruTraTri is right it is bs of reflection But what about 2nd part ? u think that glass doesn't increase the heat ? today is sunny and on my balcony +40C what's ur thoughts? 1st pic balcony 2nd kitchen behind curtain
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Ultraviolet
Ultravioletanswered grow question 5d ago
Not all IR is equal, you have near-ir and long-ir. Frequencies. 45% of sunlight is infra red. How the glass reacts with IR is what creates the greenhouse effect. You can consider infrared light "invisible heat" because it is a form of electromagnetic radiation that humans perceive as heat rather than sight, Glass blocks and reflects some infrared (IR) light, particularly longer, "far" or "thermal" infrared wavelengths, while being mostly transparent to shorter, "near" or "solar" infrared wavelengths. This absorption and reflection of IR radiation is a key reason why greenhouses get warm inside, as the glass allows visible sunlight in but traps the heat (far-IR) radiated from the warmed objects inside. Also any uv under 300nm cannot penetrate standard glass.
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Shinsimilla
Shinsimillaanswered grow question 5d ago
There are many other variables you are not taking into account and are coming to strange conclusions because of it.
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BunnyBud
BunnyBudanswered grow question 5d ago
Yeah I get what you mean, but let me put it this way: glass itself doesn’t ‘magically’ boost light or create heat. In fact, light intensity (lux/PPFD) actually drops a bit when it passes through glass because part of the spectrum gets filtered. So you’ll never get more light inside than outside under direct sun. The big difference is with heat. When sunlight passes through glass, it hits surfaces inside (walls, floor, furniture, soil, leaves) and gets absorbed, then re-emitted as infrared radiation. That infrared doesn’t pass back out easily, so it gets trapped – that’s the greenhouse effect. That’s why a room, a car, or a grow tent near a window can feel way hotter than the outside air even if technically less light is coming through. So you could say: glass reduces light a bit, but it changes the way energy is stored in a closed system – less light, but more heat accumulation. That’s why growers who use natural sunlight behind a window often see slower growth compared to direct outdoor sun, but still get a big rise in temps. It’s basically not ‘the glass increases the heat’ but rather ‘the glass traps the heat inside’. Subtle difference in wording, but makes the whole thing clearer.
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TruTraTri
TruTraTrianswered grow question 5d ago
u think that glass doesn't increase the heat ? As I wrote before. It's more or less the same. It's not the glass. You are dealing with a closed system (outside vs. inside). We have light - phenomena from question before. So you "add" energy (sun rays) in a "closed" system and catching some "heat". We don't freeze in the cold empty space where we are flying around with tremendous speed. Sorry to disturbed the myth busting and conversation you try to have with some users (and/or mouse 😅). I'm not on a side or anything, but it's just not what was stated in that question you linked in version 3.0, As it was more or less a semantic issue. Same here. So myth busting and "science" is rather quick written, but it does not help to resolve points of contention between arguments if the "Hypothesis" is missunderstood and the "Experiment" has flaws in setup or descritpion or not relevant for the hypothesis :-) Take care, and rock on😅
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PenguPoop
PenguPoopanswered grow question 5d ago
Not sure what myths you wanna bust or what you wanna try to proof but its well knows that Curtains provide heat insulation and light absorption.
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AsNoriu
AsNoriuanswered grow question 5d ago
Calcium. Screwed by Magnesium. Reduce Potassium, add some Nitrogen , never forget CalMag !
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