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Man, I'm obviously biased, but what do you mean by "best"? Everything is a trade off. It's easy to get efficiency (photons per joule) if you only use 5000K white phosphor and mono 660nm diodes, but then you're missing out on some of the best parts of the spectrum in the Far Red, violet and UV...

No. SMDs such as 3030 midpower and 3535 high power LEDs have combined anode/cathode thermal pads for heat dissipation, so the only electrically conductive material you can have in contact with them is the copper trace/track (circuit) itself. That's why when I design a PCB I use large copper pads...

You need to know what the conversion factor is before you can convert anything, because different spectra will have different Lux readings for the same number of photons. Plants don't care about Lumens (Lux), they care about photons in the PAR range. Ie; Photosynthetic Active Radiation measured...

Because according to this calculator, you are only giving them 190 PPFD, which is practially fuck all. 10,000 LUX, 3000K LED https://www.waveformlighting.com/horticulture/convert-lux-to-ppfd-online-calculator

@CobKits is a sponsor here and has some good info on those QB648 boards here: https://cobkits.com/product/qb-648-diablo/ If you want to run them in parallel, then you need a 54-60V constant voltage (CV) driver. If you plan to run at lower currents, then a CV 54V driver will work – esepcially if...

This is what we've been saying for a long time now. Far Red quenches chloroplasts which lets you get away with running a bit more UVA without the undesirable morphology of cell-contraction that tends to stunt or reduce growth. This is why we believe a "true" full spectrum is best – just like...

I will need to look that up as it was some time ago. But regardless, 6W of 280nm photons will have a much, much stronger UVR8 response than 6W of 400nm photons, as you can see in the absorption graph above. To put it into perspective, compare 6W per square meter of 280nm UVB to 6Wm2 of...

I don't doubt UVB has a negative effect on photosynthesis . . . at much higher rates, which is what the study says: EDIT: But we could also read that graphic stating "net photosynthesis" as increasing photosynthetic efficiency even as stomata are closed. Or in other words, total photosynthesis...

No offence taken mate. I realise more than anyone the limitations of what we did, however I will say one thing, and that is the trend was the same throughout all the tests we did. Yes, there may have been statistical margins of error, but when you see the same trend every time you do the same...

Actually, it appears to say the exact opposite. Net photosynthesis is INCREASED . . . but like a lot of things, it is dosage and species dependent. We already know there is a trade-off between the blue-violet-UV end of the spectrum and the red end of the spectrum in terms of yield but one of...

We have never claimed our tests are laboratory controlled, peer-reviewed studies. Growing cannabis is still illegal in Australia and so we do the best we can to standardise things. To emphasise how dangerous it is, we have already lost access to our regular cannabinoid tester because he was...

I believe that reply was intended for me. The fact he *thinks* I am saying different things when I suggest anywhere from 30 minutes to 4 hours to 12 hours of UV a day is because he doesn't know the difference between the different UV wavelengths. High UVA (such as our Hight Lights with 405nm...

Then show us. Show us exactly who has tested UVA vs UVB vs no UV – other than myself and other growers who have agreed to the tests we've published. If UVA "only destroys cell walls" – as you state – then there would be no life on this planet! I can't help it if you can't read. I've literally...

Can we see the results of your tests? Surely if it's "snake oil" then you have proven this? Should we ask the sun not to shine any UV on our outdoor plants? Because after all, it's "snake oil". BTW, you're the guy who doesn't know the difference between "Far Red" and "Infra-red" light, right...

"No logic" is stating that each of these lights have "20% more green and red". You did not follow the links I provided, did you? https://www.rollitup.org/t/more-thc-testing-uva-vs-uvb-vs-near-uv.1010801/

Really? I consistently yeilded 3.5lb from 1200W of HPS in a 4'x4' for over a decade. What is the most yield you have produced in a 4'x4' using LED? HPS can still rival LED for total yield per square foot, and there even situations where HPS can have an advantage, such as in colder grows. So no...

I addressed the research posted up by @Grow Lights Australia in the other thread. There have been three tests in total, all with similar results. You are also confusing Far Red light (700-800nm) with Infra-red light (800+nm). They are not the same thing. Blame the Chinese LED manufacturers for...

We've done more than one tets. We've done three so far, and the lights used in the other two were very similar, especially in the first link. The sedon link was between HLG Quantum boards and early High Lights that used similar LED technology and spectra...

Very nice mate. Thanks for posting these up. I know there were a few issues with some of the TE connectors and this new mod should solve that, but you've been good about the warranty repairs and replacements so far – even though I know it has cost you money. Sometimes you just have to work...

There is certainly truth to this and we have said all along that different strains have different lighting requirements. I've seen it myself when growing different strains under the same lights. But that has more to do with lighting intensities as opposed to spectrum. Plants have a degree of...