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I know why you had a hard time fitting the strips to the T-slot – because you mounted them on the wrong side! Hahaha! The flat side is the mounting side to ensure maximum metal-to-metal contact for heat-sinking. The slots on the back act as the heatsink fins to dissipate heat. And yes, the...

I have a theory that Sensi Star has original White Widow in it. But it's only a theory. Never confirmed.

At the end of Week 5 the Sweetopia is almost ready and will be taken at Week 6. It doesn't yield much, but at least it finishes early, so it makes a good stop-gap for the other plants while they continue to grow. So check out the difference between the Sweetopia and Atomical Haze after the...

Love it! It is actually one of my all-time favourite strains. But I can see how it might not be for everyone. Firstly, my preferred pheno is very sativa and takes anywhere from 11-12 weeks to finish flowering, so it does require lot of patience. However, it rewards that patience with HUGE...

Whiteberry is on my list – how does it smoke mate? Your White Berry looks similar to the Citral White Widow test seeds I'm growing out.

Good point about green being more visible to the human eye. Anthocyanins. I just happened to have this page open when you mentioned it. The solid and dashed lines are two different models. Carotenoids reflect orange light – who would have thought it! :bigjoint: And you can see how...

It's hard to find an image to depict the green light pathway, but see how the green light is reflected from within the leaf? Just imagine that it keeps bouncing around inside the leaf until it either exits (visible reflection) or is absorbed. Far red is different because it is long-wave...

Green light is not reflected off the epidermis or outer layer of the leaf. Rather, it is reflected by chloroplasts inside the leaf. As it bounces through the leaf, its path is elongated – it is not a direct path through the leaf as shown in the above image, but rather a series of zig-zagging...

Yes, but there is a definite trend. Pretty much every colour goes down in relation to far red, but the green – especially around 550nm – is not absorbed as much in relation to the red and blue. It looks like 660nm is absorbed the most followed by UV and blue. It's a shame about the hand-held...

So this isn't very scientific, I just pick a spot in the middle of the canopy and keep lowering the lightmeter down through it. Still an anomally with the UV and I wonder if it's just the light angle with a UVA diode having a clear path through the leaves, but it corrects itself later on. Top...

This is good advice and one of the few times I have read where someone really gets coco. A lot of people hand-water coco and treat it like soil, but the more you treat it like hydro (which it is) the better the results. I feed my plants 6x a day – every two hours – on an atuo-watering system...

And here is my tent just finishing 4 weeks of flower. Running about 640W of light in there at the moment. Citral Widow 3 is front left. Citral Widow 2 is front right. Sweetopia is right in the middle. Super Skunk x (Sensi Star x Sweet Tooth#3) is back left. Atomical Haze is back right. CW3...

Haha! OK, the blue vs UV spike might be explained by my hand-held spectrometer, as the Lighting Passport measures every 10nm, not every 1-2nm. If you have seen the Teknik goniometer reading of this light, the 405nm peak is actually higher to begin with than the 450nm peak. But my spectrometer...

Look a bit closer at the first photo. I don't know what their overheads are, but a 10% increase in cycle time is a 10% increase in overheads. But in terms of pure efficiency it would go backwards. 1% more yield for 1% more PPFD (almost) cancels out, but you also need to deduct 10% of that 1%...

I took three different spectrographs tonight at three different canopy levels. Have a look at how deep Far Red penetrates compared to the other spectra. Green not so much, but more than red and blue. Top canopy PPFD (400 - 700 nm) 933.97 PPFD FR (701 - 780 nm) 158.53 PPFD R (600 -...

Here are a couple of images of the grow in question. Not sure if it was the test grow, but these are the images attached to the article. First image shows how deep the canopy is and how bleached the tops are. As far as I'm concerned, they are simply sacrificing the tops to get better...

That's because they also use 1200ppm of CO2, so not surprising they can push PPFD levels with 3x as much atmospheric CO2. They don't actually state what their yields are, either, so we don't know what sort of GPW or yield per area they are getting compared to other growers. Their plants...

I've posted a bit already about both red and far red in this thread, so without repeating myself (and cluttering up this thread), what exactly is it you would like to know?

And here is the Sweetopia for comparison. It likes to branch out and stretch a little in the first weeks of flower, but it produces only small, tight buds that do not yield very well. However, it has such a lovely sweet and spicy taste like cinamon and honey that reminds me of baklava, and quite...

Here is something interesting. A bed full of living soil under a bank of High Light 420 Gen2 LEDs at 2.5 weeks of flower. There should be about 900-1000W of light in there. The plants are all related. There are three Citral x White Widow test seeds that were given by me to the grower. These are...