Search results

I will preface my reply by stating we don't use Hortisolis LEDs, because they are not very efficient and there are more efficient (and arguably cheaper) ways to achieve the same results. Most of the points you make are valid. Nichia does not make a 660nm monochromatic red – and trust me, we...

I would love to be able to answer that question but I can only offer my own observations and thoughts. We all know environment shapes evolution. If sunlight provides a particular spectrum, then nature will use it. And, generally speaking, it will try to use as much of it – or at least use it as...

The El Dorado OG are doing great. Here they are at the end of Week 5.

You will note that I did mention this at the time of posting: What I should have mentioned is that both those diodes are 5000K. Actually, the Hortisolis is 5300K. That, in itself, doesn't mean much because there are lots of ways of getting the same CCT with very different spectra. There is...

I know. And all I was trying to say is you have to learn to walk before you can run. Sometimes too much information before you understand the basics can be detrimental.

Case in point. I didn't even shut down when it got to over 40C and I was growing under HPS. Lots of air flow, lower the EC and hang on! But you're also right that the quality would vary at different times of year. The same plants would stretch when it was hot and slow down a little when it was...

Here's why I believe the secret is red and far red. Nichia did a lot of testing of their Hortisolis range and published their results. The Hortisolis LED is in red and includes a broad-based deep/far red phosphor. Admittedly, the black line is a typical 5000K CRI80 diode which would not be my...

Yes and no. I've noticed the prevalence of hermies in a lot of modern strains. Pretty much everything I have grown in recent years that had cookies genetics was pre-disposed to hermaphrodism (to varying degrees). But there were also hermies back in the day. Especially strains derived from Thai...

I'm guessing you've never seen land race sativas in SE Asia then? Hot and humid all year round. And yet . . . that's exactly where cannabis evolved! My point is that not everyone can control their environments to the enth degree and that plants will still grow outside "ideal" VPD parameters. It...

To get the equivalent of 3500K using 3000K and 5000K diodes you need to mix at least a ratio of 2:1 for 3000K vs 5000K (otherwise you end up with roughly 4000K). On a related note, we used to make two spectra: 3100K and 3500K. Both included 10% far red and 1% UVA. We had customers who ran both...

That would be interesting considering AI is programmed by man and no-one really has an answer beyond trying to mimick the sun. Ie; starting with elevated levels of far red and red at the beginning and end of the day with less intensity, increasing blue, violet, UV and intensity towards the...

;)

It was a joke mate. Although it is true a lot of us managed to grow good weed without really thinking about VPD because we read the plant first. If you have to worry about a few degrees or percentages here or there, I'd suggest you have a more direct problem.

Man, what the fuck did we do back in the days when no-one had ever heard of VPD and we had little way of controlling our environment anyway? o_O

One question about multi-channel LED lights: Does anyone here REALLY know when to use each channel? IMO, until people REALLY know what they're doing, it's all guesswork. For example, UV is highest outside in summer – during the vegetative period of short-day cannabis – so should we be using...

Hey Dan, LED Teknik and I have this duscussion all the time: spectrum vs efficiency. Teknik is a LED guru. I'm a grower (and have been for 30+ years). Much of what I've learned about LEDs is through him, and much of what he's learned about growing is through me, so we bounce ideas off each...

2700K CRI90 is one of my favourite LEDs, because it has a good amount of far red light and does not have a huge cyan gap in the blue zone. And if you buy the right ones, they can also be very efficient in terms of radiant energy. Green is interesting because not that long ago everyone was...

Haha! I think we all do :bigjoint: I'm sorry for causing a stir. I honestly didn't think it was a big deal. The guy made some claims that were rather provocative and we (at least four other members) gave him a chance to explain himself. He didn't, so it was only after then that we figured he...

That's fine, except we weren't to know he had been banned. All we knew was he started making big statements and claiming we were all driven by "ego" and then failed to back up his claims. None of us were rude up until that point.

It depends on what you mean by "performs best on cannabis" We have always seen a trade-off between the blue and red ends of the spectrum in terms of yield vs quality (cannabinoid content). This goes back to the days of MH vs HPS vs CMH. It is very easy to make an efficient light using only...