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This one is pretty simple to explain: DLI Daily Light Integral is the total amount of light the plant sees each day. As you've already mentioned, sunlight is dynamic – so those 2000+ PPFD levels are only seen in the middle of the day, on a clear day at certain times of year in certain...

Thanks for taking the time to post all that up mate. Initially you mentioned "long and short flowering plants" and I read that as "long day/short day", so my bad. Obviously cannabis is a short day species. That probably makes a bit more sense to me when we talk about average PPFD, and of course...

So I got pretty baked last night and went off on a bit of a tanget . . . lost my train of thought so I didn't end up writing what I had originally planned, lol! :eyesmoke: There was a fairly comprehensive study into the relationship between light intensity and yield conducted a few years ago...

It is sweet, a bit tropical, but with that underlying peppery Haze flavour that has hints of amonia/catpiss and berries. The smell is not as pronounced as the original "Stinky Catpiss Haze" pheno I grew from the same batch of seeds 15 years ago and kept for many years, and the high is more...

1 plant, 1lb. Dried and trimmed after 12 weeks of flower.

That was the very first LED light I designed in 2018 using a combination of Nichia Optisolis for the Far Red and Seoul Semi for the UVA. It has 5% Far Red and 0.4% UVA. There are still guys growing phenomenal weed with these LED panels. 2.5 umol/j as well. This was the next one I designed with...

Again, apologies for being late to the party, but I'm limited for posting time these days. However, these threads do at least give me an excuse to research! So I guess the first question is, if you are growing cannabis, what light level do you use to flower without supplementary CO2 and how do...

I did a bit of research into NASA's earlier experiments and it was from this (NASA's) work that we began to understand optimum blue levels for fruiting and flowerig plants was around 10-15%. This was before similar experiments quoted above. The thing about the NASA experiments is they were...

HLG have made a very efficient board. Indeed, they are among the leaders in grow light efficiency and they have a very good relationship with Samsung. I have a few different ideas about what makes the best plant-light spectrum, and that shows in the finished product. It's not easy – in fact it's...

You too :bigjoint: Ah, been busy with things lately, but I do enjoy reading a bit of scientific research knowing that our knowledge is constantly evolving. I'm not saying everything I write is 100% correct, but I try to be as correct as I can be with my current level of understanding.

Which light and grow area are you talking about? You can't make blanket statements about hang heights until you know the light intensity, layout and canopy coverage. Just sayin'

Sorry for turbo-posting, but I just found what I was looking for. Fluence's R4 spectrum Fluence's R6 spectrum My spectrum (Grow Lights Australia), which is in-between but also has much more far red as well as UVA

From what I have read, it was strain dependent. Interestingly, this research appears to correspond with exactly what I was saying about concentrations of red light in chloroplasts. https://www.linkedin.com/posts/davewhawley_icl-spectrum-results-activity-7070064731360808960-ytz_ The taller...

In response to the OP's question, it all depends on how big your light is compared to your grow area. If the fixture is big enough, then red and white light (which also contains blue) should be optimal. But if you don't have enough light to begin with, then turn everything up, as the extra blue...

Bruce Bugbee has never grown a high THC cannabis plant – Utah University only grows CBD strains. He also sells Apogee light meters, so never forget what his TRUE agenda is. To sell more light meters! He also contradicts himself a lot . . . but I digress. There are some missing pieces of info in...

11 square feet per meter (10.76 to be precise) is closer, but I use 10 because it's easy to work with. I also agree that up to 400W is about right for a 1m x 1m area and up to 600W is good for a 1.2m x 1.2m area. But it depends on the lights and plants. I grew out some hazes next to some newer...

First the maths. I assume you mean the following: 0.8m x 0.8m = 0.64m2 1.2m x 1.2m = 1.44m2 There are also roughly 10 square feet per square meter. So you want at least 480W per 1.2m x1.2m tent, but it also depends on the light – these are ballpark figures. So two 240W panels will fit the...

He's trying to reach a plea bargain. He's going to lose his house and car and some other assets, but they've let him keep his business assets. He is still likely to spend time in jail, but is trying to plea his way out of it.

Apart from the K deficiency, your plants look fine. We run over 10% far red in our lights and 1% UVA and we run them the whole 12-hour cycle. You're not going to damage your plants with too much Far Red, and they won't stretch excessively if you have UVA in there to counter shade-avoidance. But...

That's not magnesium, it's potassium lockout. Notice how it is the largest flowering plant. K deficiency/lockout always starts at the tips and edges of the leaves and you notice it throughout the plant, as it is a mobile nutrient. Too much Cal-Mag in mid-late flowering will lock out potassium...