My DLI is 38.8 in veg (18/6) and 43.2 in flower (12/12).
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Must add a little light horsepower during flower. Drop hours 1/3 yet increase DLI. With all of the light you throw in there I would think the DLI might be higher.
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If you have a phone with a great camera, the korona app (with a paper light diffuser) is very close to the $500 apogee meters. I tested the app next to, I believe, an apogee 500. And I can remember the exact numbers but they were close enough for what we need. So I take the average ppfd and plug it in to this equation to calculate DLI
PPFD x (3600 x light hours)/ 1,000,000 = DLI
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I give about 600 umols in veg and about 1000 umols in flowering. I only use 220 watts at most in veg and have about 800 watts on tap in flowering but keep it down to around 600 watts which still gives me over 1000 umols in the center of the canopy and just slightly less at the corners and edges, my lights are setup for wall to wall and corner to corner coverage.
I could easily get DLI over 60 in flower if I wanted to with my flowering lights but without additional CO2 I donât see much point in going over 1000 umols.
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Yeah I can see that 
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Yeah, its his fault, just like its his fault I slept with that ugly girl that nightâŚ
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Caught this while at work, grabbing the app and will do some work for you tomorrow when itâs lights on
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What is your light height at these numbers?
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The HLG panels, Now itâs a 650S Slim all 3 spectrum is dimmable and I think the umols\j is 4 or 4.5 I think 
, I could of been high 
, so donât hold me to that, but " Curtilux " has one to thatâs unfolds for a 4x4 or 5x5 tent which is rated 3.5 umols\j for $500 less than the HLG models, I think itâs $799 and the 650S Slim Optic is $1299 if I saw that right a few months back, I be trying to keep up. I here great praises on the HLG , are they better then Gavita ?
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@Nicky dunno how accurate the app is but itâs looking around 45 DLI on canopy and around 35-38 right on the front edge. This lets me know I should move light forward a few inches to keep an even spreadâŚ
Iâll get more readings after harvest and I can access the rest of the area
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Edit my numbers are flawedâŚI set app for 12/12 not 10/14⌠probably getting closer to 30-35 dli on center
Which leads me to believe by reducing the hours of light weekly by 15 mins during flowering we can dial in that 45-60 dli to start with reduction to 30-45 by the end⌠further data readings will be needed to confirm this hypothesis
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My lights are about 28" above the canopy.
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Depends, HLG comes out a new light and itâs the best/most efficient for a while, then ChilLED puts out a new light and itâs best for a while, same for Gavita. I feel HLG is probably the best for itâs price, anything even marginally better usually costs quite a bit more.
Iâm still very happy with my HLG lights (550 rspec and 260 rspec, many 135 rspecs and bspecs) and donât see any reason to upgrade for a while, unless something much better comes out.
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What app are you using for your DLI?
Is it set to the right spectrum for your boards? Your running HLGâs so I would think doing the DLI calculations after taking your own lux and inputting it into HLGâs lux to PPFD calculator would be more accurate
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It would be but then I also have to adjust it for my crazy light schedule 
Some free lux app on iOS, can annoying recommend a decent one?
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I used the top one with the pink and blue light with the circle, it has lux, it has ppfd\dli and it has a pull down option for what type of lights and itâs every type of model on market and how many hour intervals, which I think itâs cool and very resourceful .
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They really need new spectrum options in these drop down menus for those of us with reds.
3500k + 690nm.
@PharmerBob your crazy light scedule?
You just add the total number of hours the lights are on in a 24hr periodâŚ
@yoshi unless that app has an option Iâm not seeing for the reds and 3k/3.5k?
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Photone⌠mine has a full spec led tab but not specific for rspec hlg
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Alright so I googled the best ones and then used measurements from both to get the most accurate pic readings I could. Took that to hogs site and used their automated calculators and here we are
1161 Ppfd for 10 hours a day
41.8 dli
As I reduce to 9 hours in the next few weeks it will bring that down to 37.6 dli in late flower
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