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Every grow has some problems, but the latest HPS vs LED grow was one problem after another. Just stating facts. The sulpher burners were left on to long on the LED side. The folier spraying was botched. The LED side over-watered. It took weeks just to get a PAR meter to adjust LED light...

So what kind of dry nutes are you using?

I agree. A PAR sensor will leave the +700nm photons uncounted, and a 90CRI LED will have more uncounted photons than a 80CRI LED. BUT, the photons above 700nm are not discounted by the plant! I agree with GG that the "True PAR" range of 316nm to 782nm is more representative of what is...

Looks like you and Mr. Internet have been spending some quality time together! No doubt the 561C is near top dog in efficiency these days. This will be my first foray into CRI 90 LEDs and definitly into a "2 spectrum" strip. I like the idea of going heavy on the 5K and light on the 2.7K for...

Not sure how to calculate YPF from the SPDs of the 5000K and 2700K LEDs. You'll have to wait for a bigger brain to answer that, BUT $10.76 (Digikey price) for 48 watts of "tune-able" LED strips sounds very interesting! OK, so until a real brainy mathematician addresses your question, check out...

Is that the 2.079" heatsink you are speaking of?

You can learn a lot by watching the videos on their YouTube site, OR cough up the bucks for their print book. I choose to watch the videos.

I'm interested in your observations. If your observations are correct, you can tailor your plant's "photon diet" or DLI to what ever the plants top leaves are tell you at whatever stage the plant is in. So optimal photosynthesis all the way through. Sweet.

The Ministry of Truth knows what's best for you. You'll thank them later.

As a fellow LUX meter user, you might enjoy this thread. https://www.rollitup.org/t/par-multiplier-thread.928907/

I've used 2 to 3 year old Maxi with good result. I think the plants will let you know if your 10 year old Maxi has lost its mojo.

Great. I have noticed that the leaves start to sag the last couple of hours in the day in my garden. *BTW, I too am an old guy with a little time, and resources and patience to devote to growing. We gotta help each other! So in post #66 you said, “It is about the same, nothing noticeably...

Fascinating stuff! I want to make sure I get this. So you're saying the "optimal" amount of light (or DLI) for a plant in a day is when the leaves start to sag? That is basically when the plant taps out for the day and any extra photons are basically wasted? I would love to see pics of your...

Got it. Thanks. Makes a lot more sense now.

Great to see you posting your notes from your garden. Please clarify then "4/2g gallon through to week 8" from your post above. And over 2 ounces a square foot from less than 800 umols and no CO2 is quite good in my opinion. Keep it up. My res gets in the low 70s. But with Hydroguard I...

Like those Scotchloc splices on your wires...must be in the communications business! I have a box myself.

That's the nice thing about da herb...it slows you down so you can appreciate the little things like your flowers blooming and notice a visit from a bumble bee! Go ahead and digress! Great shots of da herb I might add.

Good video, but for the average guy without all the zoomy measureing equipment, wouldn't just measuring DLI be good enough? https://www.rollitup.org/t/cannabis-daily-light-integral.921153/page-2

CCCmints Not strange at all. Tent reflectivity can vary considerably. Even a quality PAR meter like yours can vary +/- 5% easy between meters. The true test is an independent PPF reading from a sphere. That withstanding, same tent, same meter would have been a much better comparison test...

You're not the first hps guy to get a chubby for QBs...nor will you be the last. The only valid comparison would have been to test and compare readings from a HLG-550 in YOUR tent with YOUR meter. Then your comparison graphs might have meant something.