Search results

Congrats on buying a light meter and putting it to good use. I've littered the pages of RIU and other sites urging growers to take that step because it's the easiest way to get healthy plants and high quality crops. DLI of 20 mol is very low but there's no reason to not increase DLI very...

VPD is a sound way to create the optimal temperature and RH combination for your plants. You can spend a lot of time and money optimizing VPD. I'm more than happy to share (at great length) how to do that. Cannabis will grow, very well, in temperatures of about 80° (up to 85 in veg and early...

Leave them alone. It's a healthy, well shaped plant so I can tell that a you've given it a fair amount of light but I would give it more light. The plant is not compact and bushy so it hasn't been grown with a light with a lot of blue in the spectrum and hasn't been grown in "high light"...

Not an issue if you're getting the XS-1500 Pro. That's a great light and Vipar really raised the bar in the 2' x 2' market.

Hah! I was just about to recommend the Vipar and a couple of postings showed up! The XS-1500 Pro is a superb light for a 2' x 2' tent and, short answer (I need to get back work) is the Vipar is a better quality product but the mystery light will put more light into your 2' tent. Is the driver...

I understand the goal and I believe that your approach is the right way to go. To stop the loss of secondary metabolites, we've got to keep our temps down. The magic number, according to Mitch Westmoreland, PhD candidate under Bruce Bugbee, is 78°. In his 202o video on "hemp" he mentions that...

Light is the only way that cannabis plants can make food. If you reduce light levels, the rate of photosynthesis drops which will tend to slow growth. Crop yield (flower mass) and secondary metabolite production are a function of growth. The old formula for yield used power draw (watts from the...

And they'll have a small number of large leaves and a smaller number of stems that are thin and weak. When you see tall plants with this those characteristics, it probably an indicator of a plant that didn't get much light. No doubt, yield and quality are diminished as well. Light is the only...

Get as much light on your plants as they can handle. That's "the light saturation point". Light is the only way that plants can make food. The more light you give them, up to the light saturation point, the more your plants can grow. Plants grow better (more stems and leaves) and provide a...

"They're so happy they need to get a room."

Thanks for the info. That explains the color. Keep it maxed out but the tacoing leaves are a warning that those leaves are getting too much light. Other than that, you're looking great!

Those plants are looking really good. Congrats. You're giving them lots of food (light is how plants make food). And thumbs up on the Jacks' — I switched to Jacks after a few grows. Works just great. There's nothing magic about growing autoflowers though I do understand the complaints about...

precision ≠ accuracy. Software solutions are very likely to be inaccurate because of the sensor. The calculations use the same conversion factors that I've posted. One major source of error is that camera sensors are designed to read only light coming directly into the sensor. If you poke...

That's a nice looking plant. Congrats! In the first photo that you posted, the leaves closest to the light are starting to "taco". That's a symptom of getting too much light. The leaves just a few inches lower are doing fine. Those two sets of reactions indicate that you should raise your light...

The light a lux meter reads is usable because it's within the range of PAR. Light meters measure light in the spectrum to which the human eye is most sensitive. PAR meters measure a broader spectrum. This graphic illustrates the difference in the spectra that the light meter reads vs the PAR...

It only goes up to 50k lux? That's suprising. Attached is a document I wrote about converting lux to PPFD. Even with a very efficient light like a Growcraft flower light or a Diablo, that's only a bit over 800µmol. A standard white LED has a conversion factor of 0.015 so that would max out at...

You've got fabric pots so you can put holes around the lip of the pots and tie them down with a roll of twist tie. My res has a solid plastic top so I use shower hooks and ½, 1, and 2 oz fishing weights. I use a silica supplement and veg using a very light so the branches are pretty strong. A...

I agree there's a lot of variance in strains and the goal should be to get the grow to its light saturation point. My opinion is that growers won't get to the LSP because they're afraid of damaging their plants. Instead, the number on the dial is a convenient way to "optimize" their grow. The...

65° is getting near the point where you're not getting any P uptake. If you can get water temp to 68°, you can remove that from the equation. If the air temp is 70°±, that would cause a small plant because the metabolic rate is very low. It's not a light issue. 300µmol is good for a young...