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Light question

Newbie87
Newbie87started grow question 10 months ago
Growing autoflowers, if you gave them 2 hours less than the recommended light; would it just take a bit longer for them to fully mature or seriously affect the yield ?
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Setup. Lighting
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Sciolistic_Steve
Sciolistic_Steveanswered grow question 10 months ago
hahaha, gottagrowsometime called it... i tend to show up on the light questions. and i spoke of a higher rate of photons -- that's just a stronger light. specifications of any decent light will give an honest umol/s value. for example, a FC-3000 gives about 840 umol/s. you'll reach 35-40 DLI with that in an area up to 1 meter squared, which in this case would be 840 PPFD, conveniently. if you good daily light integra chart you ca reference 840 with various hours of light and see it is somewhere in that range, i know off the top of my head it's 12 hours but not exactly what the DLI is. Ah, 850 PPFD over 12 hours is 36,7 DLI. Now, these are ballpark ideas and not meant to be used in exact ways. you start here with a mature plant and then adjust to what you observe. internodes are too short? give less light. Internodes are too long/lanky? give morel ight. Simple as that, but this will allow you to properly size light to area or speed up learning process of how to position the light for best coverage etc etc...
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Newbie87
Newbie87answered grow question 10 months ago
Thanks guys, I think I understand now. My new timer from Anazon isn't working & I'm really struggling with the light leaks from this crappie tent when I trying to sleep.
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1kodah
1kodahanswered grow question 10 months ago
I really don't want to poach someone else's question but a huge thank you GGS for the comment you made on this question. You just solved the mystery with a drama-lama wilty plant I have been struggling to make happier. Much gratitude, may the sun shine on your garden.
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Sciolistic_Steve
Sciolistic_Steveanswered grow question 10 months ago
hours is part of the equation, but it's more than that. umol/s is photons per second of light in a specific range of wavelengths. photons per second, being the key. if you give a higher rate of photons you don't need as many hous of light to reach the 'maximum' your plant and evinronment allows per day. DLI, or daily light integral, is the concept here. studies show if you give the same amount of DLi over 16 hours vs 18 hours vs 20 hours it makes no discernable difference in yield beyond normal volatility. So, if you reduce 2 hours from 18 hours, you need 1/9th (11,1%) more umol/s over those 16 hours to provide the same energy you did before. It's proportional to hours of use and umol/s provided (technically, umol/s per meter-squared = PPFD which is what you reference to calculate DLI) Becoming familiar with this makes communicating about lgiht in different gardens as apples to apples even though the power and area covered will vary. 35-40 DLI is going to be the max with ambient CO2. if you regulate your environment you can push 50-60 DLI. (light, co2, temperature rh, et al.. circulation is all part of environment)
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MisterAeroponics
MisterAeroponicsanswered grow question 10 months ago
More light= more yields (To extent) with healthy plants
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Terp1
Terp1answered grow question 10 months ago
Um die Frage aber kurz zu beantworten: JA, es würde den Ertrag beeinträchtigen! 😇
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gottagrowsometime
gottagrowsometimeanswered grow question 10 months ago
Into this with auto growing. I've learnt a lot about this and I see how I was stressing my plants. When they do go into rest. They get really droopy and can stay like that until lights go back on. That's signs of your DLI over reached and light stress.
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gottagrowsometime
gottagrowsometimeanswered grow question 10 months ago
Now, here's a good question, common and widely misunderstood. Creepy Steve will give a better example but here's a tid bit Has nothing to do with hrs recieved pal. Has all to do with DLI. I highly suggest you to off a DLI chart. As in early stages your DLI needs to be real low as a seedling. So you need to reach 20-25DLI over your seedling stage. So, I'm not sure of your par output/ppfd chart but you need to add your PPFD received over HRs given. With autos you can either do the 2 ways. As they don't depend on light timing to flip. But ppfd / DLI needed. Check a chart. You'll find the perfect range for seedling. But, as it goes on in your grow you have options to reach your DLI either in 14hrs or 10hrs. I suggest you look
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Terp1
Terp1answered grow question 10 months ago
Es kommt um Grunde nicht auf die Dauer, sondern die Gesamtmenge an Licht, also den DLI an. Du kannst in der Theorie, das weniger an Lichtstunden mit mehr Leistung wieder ausgleichen. Der Ertrag hängt aber von so vielen unterschiedlichen Umweltfaktoren (Wurzeln, RH, Temp, Nährstoffe, PH... etc, etc) ab, dass du das weniger nicht bemerken wirst, wenn du nicht weißt, wieviel es geworden wäre. 😅😎
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