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You're right. It's the XS3000. The 2500 appellation is my mistake. I don't see a listing for the XS2500 on the Vipar site - [checks site] Got it. There is a P2500 which is a board light. Shane did a review of the XS1500 Pro in the early part of this year, I seem to recall. Reviewing the 3000...

As hang height increases, the PPFD map gets better but PPFD, overall, drops. Is that a TS series light? "next run I'll go for 32 tops, and really lollypop and trim alot to leave only main colas. Itll be an experiment. Maybe ill make a journal out of it ;)" Ouch! Leaves are vital for plant...

Thank you. I haven't seen anything that looks at it from the perspective but my sense is that it's the percentage and it's a function of long term exposure. I say that only because blue light inhibits cell expansion, which leads to shorter plants and smaller leaves. (I think that the issue of...

Ouch. Sorry to hear that. :-(

I'd bump it up to 19. At 17.8/64, P uptake is/begins to be inhibited (I don't remember which is it). The increase in DO is minimal with a 1°C change but the possibility for decreased P uptake and, therefore, a nutrient imbalance, starts to increase. My chiller is set to 20/68 and the Bluelab...

Found this while reading some other Frontiers papers.

I agree. These photos show signfincantly more yellowing. Not a lot, I'd argue, but enough that it should be dealt with and because it's trending to worse. This graphic is really help as a checklist: Temperature, RH (which go together as VPD) are important because they drive transpiration...

I checked out the attached paper "Principles of Nutrient and Water Management for Indoor Agriculture Principles of Nutrient and Water Management for Indoor Agriculture " which has been gathering dust in my laptop. If you scroll down to Action 3.1, you'll see that text I've highlighted some text...

UV C is very good for that, no argument. Fortunately, the atmosphere filters out 100% of UVC because it's harmful to living beings, even in very small doses.

I know very little about soil growing or nutrient issues, but based on comments here on RIU and on a few trips to pictures of nutrient issues, I'm thinking that leaves that re turning down and have a dark green coloration have been impacted by overwatering and, for the latter, excess N. "Light...

Hmm, I haven't read that paper in some time, probably since 2022 but, now that I read it again, it really is just chock full of good stuff. In fact, a lot of what's in that paper is in Westmoreland's You Tube videos that the did this Spring. In those vids, he shared some of the research that he...

Dried flower. Westmoreland gives yield estimate based on mols of light over the life of the plant. That's the modern version of yield esitamators that used wattage of the HPS bulb. Those are very old school so I never used them. The yield estimate is right up front, in the Abstract...

I've been reading about that since soon after I started growing in 2021. I haven't been able to grow small plants, auto or photo. Both types have generated yields of >700 gm/sq meter. I stopped growing autos because I can't control the size but, in terms of yield, I've had zero issues...

Chemicals is chemicals. The plant doesn't know if the chemicals came from bottles with pretty labels or a sack of dry ferts. The nutrient mix should be very similar from one line to another but the biggest reason to be able to switch is that plants function in a range of chemicals and, since the...

Your pH is good at 5.8. pH rises or falls in a hydroponic res as a result of exchange of chemicals between the nutrient solution and the plant. In veg, pH will tend to rise, in flower it will tend to drop. This is completely normal and is a reflection of which chemicals are being taken up more...

"My kid sprained his ankle so I took away lunch." It looks like you've done a really good job lighting your grow. Those plants are nice and compact with lots of branches and a lot of small leaves. Those are all signs of a plant that's been well lighted. Congrats. Per my tongue in cheek...

They're way under lighted. Your plants are tall and slender with not a lot of branches and leaves. Those are characteristics of plants that are not getting much light. Add in the fact that you're cutting off leaves and your plant is struggling. At 50% and 30", they're getting seedling levels of...

If you can't ventilate the grow area, that's going to make things tricky. You should keep temps at the canopy <30/85 degrees for germination, seedlings, veg, and into the second week in flower. After that, 85° will severely reduce the amount of cannabanoids, so you should get temp ≤25/78° In...

One of Westmoreland's earlier studies.

Blue light inhibits cells expansion, red light tends to increase cell expansion. One of the reasons to use a veg light is that it makes plants short and compact. I use a veg LED and a flower LED. The plant below was vegged for about 40 days under a Growcraft X3 light. It was topped at day 21 and...