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My apologies if I came "preachy". <insert "stepped on dick" emoticon here>

I don't own the light but I've spent a few hours studying the G4500 and the SE4500, both the current version and the previous version. The previous version was an excellent light with a 430 watt driver that put out the highest PPFD I've seen (with the exception of the Growcraft Ultra) with the...

60% is about 900µmol at 10" which is good light but the icing on the cake is that you can raise that light about 8" or so, which will let your temps fall, and still get "lotsa light" on the canopy. I've done half a dozen grow with the Growcraft and have had temps at 80-85. It was only this year...

I'm not clear on the question and I'm a hydro grower so I have very little understanding of soil growing.

Oh, yeh, that's a beast of a light. I run my plants up to 1100µmol± but I want a light that can generate that much light in my 2' x 4' tent, at a hang height of 18" and with a red heavy spectrum. I just finished PPFD testing of the Mars SP3000R and it's going back. I wasn't able to come up...

An EC meter measures the electrical conductivity of a solution. There is no such thing as a "PPM meter". PPM is not a measurement. PPM is a calculation that uses the EC value and it indicates the parts per million of either sodium chloride or potassium chloride that would be needed to have the...

That's really impressive. The PPFD values are very high but they're also incredibly uniform, even at 10". And it gets better as hang height increases.

OK, got it. I knew that high watt driver had come from a big light. Thanks for that piece of the puzzle!

You're welcome.

Unless you are doing tissue analysis and adding specific chemicals to keep the levels in the leaf tissue at a certain range, the safer course of action is to top off with RO/plain water and swap the res when you've had a certain % drop in EC or when you've added back a certain amount of plain/RO...

I'm skeptical, by nature, but you're taking it to another level. "Good post. I was v nervous about frying my plants and v gradually increased the power on my xs2500pro. It's very hard to damage a plant using an LED grow light. It takes "a high level of unfamiliarity", to be kind, or...

Got it. Some growers pooh pooh the idea of clear trichs. That's the only reason I brought it up. Good to hear. I guess my rationale is it's mostly 'kush' genetics with a bit of WW in the mix, so I was thinking maybe let it go a bit longer being more indica dominant... but I'm really on the...

Grrrr… You got one of the good ones. The new 4500's use a 320 watt driver vs 430 and PPFD is far lower than your light. On the positive side, the spectrum has a lot more red in it but, overall, it's a step down for a lot of some growers. The V1 4500 was a PPFD monster. I'm looking to replace...

I agree. There's a fair amount of bulk added in the last few weeks. Conventional wisdom says that flower that's harvested early leads to a "racy" high vs a more mellow high from flower that is harvested later. What was the impact of the "early harvest" smoke?

Thank you for providing these papers. Both very interesting reads. The latter - I agree with your comment on that finding and it would be interesting to see the outcome of combination UV treatments with the 800µmol and 1kµmol levels. "interesting" is key because the cost of adding supplemental...

I can't make an argument for removing healthy leaves from a cannabis plant. And the only rationale I've seen for removing leaves to expose bud sites is "because". The problem with removing leaves at the top of the canopy to expose bud sites to light - it assumes that bud sites need light to...

THC content is highest when trichs are clear. As they age, TCH content drops and the trichs change from clear to cloudy to amber and then black.

And it's a board light with an on board driver (so it's going to be warmer than a bar light with a dismountable driver).

The Vipar site has had problems with their product listing pages for the 1500 and the 2500 for months which is pretty sad. I can't find a link to it but you can get to the product page by using the search feature. The link is here. This is their PPFD map. The PPFD map from Amazon is shown below...

It's a healthy plant and it's great that you've topped it. That will make it much easier to light property. I agree with @amneziaHaze about the size of the plant. What's your PPFD and your light schedule? If you're not measuring light, what model light, hang height and dimmer setting? A lot...