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How old are those cultivars? If they are descended from any of the Skunk/Northern Lights/Haze/Afghans that are the building blocks of most modern strains then it is almost certain that they were originally selected under HPS. The fact they were being grown in the Netherlands means they were...

Yes we have done some tests on this and found that UVA nearer to 400nm works best because strong UV such as UVB and short wavelength UVA also degrade cannabinoids as it stresses the plant into producing them. We noticed this when we compared supplemental UVA around 400nm and UVB reptile bulbs...

I'm going to reply to this post because there is certainly a lot of truth to it. Cannabis was grown indoors and selectively bred under HPS for decades which meant that those strains and individual plants that performed well indoors under HPS were bred over generations and passed on their genes...

It depends on the diode. UV is a large range (280-400nm) so diodes that carry less energy (UVA >385nm) can usually last for the effective life of the fixture. It also depends on the quality of the diode. As mentioned UV bars can create hotspots in the canopy because they concentrate the UV light...

We've done a bit of testing comparing UV levels. The first thread is by @Prawn Connery who designed the original High Light. THC, CBD, Terpene test results – UVA vs UVB vs none https://www.rollitup.org/t/thc-cbd-terpene-test-results-uva-vs-uvb-vs-none.1001617/ More THC testing – UVA vs UVB vs...

You are right and I will post some spectrographs to try to provide a fair assessment of why that 0.2% doesn't really count. The Mars light does have a number of 410nm diodes, but they are very weak which is why you do not see a spike at 410nm on the spectograph as you would expect. 410nm is not...

There is no UVA in your Mars Hydro light. Seriously. That's all I'm saying. I didn't post those spectrographs to start an argument. Perhaps I could have been more diplomatic. I'm not making fun of your choice of light. They can still grow plants.

Would you use any other light with it? Research has shown there is a trade-off between quality and yield on either side of the UVA and Red/Far Red spectrum. The UV/violet/blue ends of the spectrum increase secondary metabolites such as terpenes and cannabinoids while the green/red/far red ends...

The FC-E is the economy model using Bridgelux diodes instead of Samsung (FC series). It is the same light, slightly different diodes. I'm not here to sell you a light only to point out that your lights have almost no UVA, only residual photons below 400nm. Here is Mars' own website with their...

This is correct. A good spectrum is a good spectrum and will veg and flower faster than a heavy blue spectrum. It is a bit of myth that you need more blue light during veg. The term "full spectrum" is also overused in this industry. A full PAR spectrum should run from at least 400-700nm. An...

We have 10% Far Red in our lights. There are ways to counter stretch (shade avoidance induced cell expansion) by using UVA at the other end of the spectrum. Adding even a small amount of Deep Red (660nm) and Far Red will make a difference to yield and I would suggest that with 400W of 4000K...

I hate to break it to you but those Mars Hydro UV diodes are not worth the plastic they are made from. Here is a spectograph of a Mars FC-4800 and as you can see the 410nm UVA diodes do not even show up. There is one diode per bar and they are of such low quality that they hardly emit any light...

I would go with the manufacturer's recommendation which is straight to 12/12. Our fixtures have UVA and are designed to be run 12/12. But there are a couple of differences between what we do and what HLG does. Our UVA diodes are integrated into the lights for better (more even) spread. The main...

Thanks for the mention. Here is a link to the test you're referring to. There are links to other tests in the same thread. https://www.rollitup.org/t/latest-uva-vs-uvb-cannabinoid-test-results.1052083/ UV radiation is measured in milliwatts. The Nichia UVA diodes we use are over 70% efficient...

Thanks. Our spectrum is made in Australia, too. :P I don't think anyone really designs spectra in China. They don't have any experience growing cannabis so they have to copy others.

If I could set the record straight I will tell you exactly where all our parts come from and where they are manufactured. LEDs Nichia are made in Japan. We use 757 series and UVA 3535 We also use custom LED Teknik LEDs which are specced in Australia but manufactured at a boutique factory in...

I don't know who considers Spider Farmer "the best" but of course we are biased! As far as I'm aware Spider Farmer and Mars are made by the same company. I can't tell you which Bridgelux diodes they use but I generally like the Bridgelux phosphors compared to some others. Like anything you get...

Chlorophyll A has an absorption peak around 430nm but there is still plenty of absorption from 400-420nm if you fill in the entire PAR range. Chlorophyll B peaks in the cyan range which is really lacking in the EVO even compared to typical 450nm blue pump phosphors which already have a deep cyan...

Here is an interesting read on Samsung's anti-sulfurisation. I don't know how accurate it is because they seem to lump LM301B in with LM301H so perhaps they tested 301B instead of 301H. But anti-sulfurisation is not really that important when you conformal coat LEDs so it provides no real...

I will explain myself but I must warn you that this will be a very long and somewhat technical post. We'll start with the Samsung data and ask a simple question. Why does it not add up? The forward voltage is listed as 2.7V at 65mA which is 0.1755W. Now divide 0.56 umol/s by 0.1755W and you...