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Is the dli calculation different for Auto flowers?

YezHazeEz
YezHazeEzstarted grow question 18d ago
Is the dli calculation different for Auto flowers?
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yan402
yan402answered grow question 17d ago
DLI calculation is the same for autos and photos yeah, it’s just photons per day. The only real difference is how much light your plant can handle based on genetics, age, environment. Autos usually want less early on, but by flower it’s pretty much the same as photos if they’re happy. No need to overthink it, watch your plants, adjust if needed. Numbers help but plants always tell you first.
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Seashell
Seashellanswered grow question 17d ago
bro this aint a fkn chemistry class dli is just how much light a plant gets in a day, autos or photos, dont matter. autos usually dont like gettin smashed early on cuz they small, roots small, pots small, genetics different. real life stuff. not your lab book. by flower? same rules as photos. they eat light if you raised them good. if not, they stress. simple. i swear every time you reply its a damn novel nobody asked for. wall of words sayin nothing growers actually use. your plants dont read textbooks. they dont care about mols per square avocado or whatever you're on about. they show you. leaves up good = feed light. leaves taco, claw, bleach = too much. real growers watch plants. most these fellas tryna run a tent not split fkn atoms. save the lecture for your diary bro. dli calc is same. learn plants not just charts.
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00110001001001111O
00110001001001111Oanswered grow question 18d ago
no. DLI is simply how many photons per 24-hour cycle. They are counted in moles. If curious, look up "Avogadro's number" for exact definition of a "mole" 1 mole = 6.023*10^23 ... of photons, molecules, etc. it's origins are more about chemistry, therefore photons are also broken down into this increment to understand interaction with molecules as opposed to per gram. "per gram" is an unsophisticated, unresolved metric for such things. It is severely lacking. There is variation in how much you can provide... some of it is genetics, but as far as what you control it is your environmental variables, specifically temperature, relative humidity and atmospheric CO2. If these don't jive with how much DLI you provide, negative things can happen... too much will damage the plant, too little will cause excess stretching. There is no target value that is a one-size-fits all. In the end, you cannot just shoot for a specific DLI. you must always observe and adjust based on the plant's behaviour. DLI is a useful tool and not an absolute value to target. DLI, once calculated, does cares not for hours of operation, as that is already part of the calculation. DLI allows apples to apples comparison of light applied regardless of area of coverage or hours of operation. 35 moles of photons per day is 35 moles of photons per day whether over 12 hours or 24 and whether covering 50m^2 or 1m^2. Consult any DLI tabele for reference. you need PPFD and hours of operation. PPFD - people very often don't really know what this means, either. This is umol/s of PAR per meter-squared. IT is phonton per second relative to an area, thefore you can compare different sized areas with this value and it makes sense. 900 PPFD for 2m^2 and 900 PPFD for 1m^2 is providing same rate of photons across the entire area. There are just 2x as many per second in the area that is 2x the size, obviously. That alone is fairly useless information. PPFD and hours of operation can be used to calculate DLI. DLI is what matters. PAR - photosynthetically active radiation. Also, read up on "ePar". Turns out a slgihtly wider range of wavelengths are causal to photosynthesis than previously thought. 1 single-location measurement of umol/s of PAR is PPE or PPF. This is totally different from PPFD.
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ATLien415
ATLien415answered grow question 18d ago
Target DLI is often used to represent a strong summer day. For an auto, this would depend on your photoperiod. Are you giving it 8 hours of light? Then high intensity lights to reach your DLI. Are you giving it 18 hours of light? Then low intensity lights to reach your DLI. This is math. You are doing an integral. Area under the curve. The area is the light you want to fill, the curve is intensity versus time. You can do this math with PPFD.
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Ninjabuds
Ninjabudsanswered grow question 18d ago
I’d say give similar amounts of light The only advantage I see to being able to give autos more hours of light is if your using a grow light that isn’t very strong so then they get more hours of light adding up to the same dli as if you had a stronger light
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TruTraTri
TruTraTrianswered grow question 18d ago
No, the DLI (Daily Light Integral) calculation is the same for autos and photoperiods—it's based on PPFD × hours of light. Autos often run 18–24h light, so they can handle higher DLI (35–45 mol/m²/day in flower). But don't over-focus on numbers—plant response, environment, genetics, and light quality matter just as much as calculated values.
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einamio
einamioanswered grow question 18d ago
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