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Saying there would be no benefit or measurable plant responses from a full changing spectrum compared to a control spectrum is a bold statement, considering that’s what plants evolved under. I personally don’t think it would be difficult to achieve. There are already plug and play light...

I just want to know how this conversation will lead to growing better weed? Or making better LED lights?? Does the atmosphere as a whole refract and disperse light like a glass prism? No. Can individual particles in the air refract and disperse light like a glass prism? Yes. See ice crystals...

Sounds like ya’ll are arguing the semantics between scattering, refraction, and dispersion of visible light. In that context, light scattering is not what causes the ROYBGIV we see when looking at a rainbow, that would be refraction/dispersion. But… the proportions of colors in the ROYBGIV of a...

Yes, this is accurate and the reason why the light spectrum that we see at the surface of the earth varies throughout the day/month/year/location as well as local weather & air quality and even elevation. The atmosphere with all it’s molecules and particle’s, particularly water vapor and dust...

Tarantula Voyager spectrum(s). Some basic 80 CRI white (looks like 4000K & 2700K) + Evo Mint diodes with a couple of 660 nm monos. Looks like the Evos and cooler temp “white” chips are on the same channel, and the warmer “white” chips and 660nm are on the other channel.

Where does GML post their Spectrum Distribution Graphs? I can’t find any on their website and only found one pic on IG that shows the Voyager model’s tunable spectrum. Seems odd not to have the spectrum graphs of each model on their product page. Especially for lights that are in the upper...

Rocky Mountains aren’t cold huh?? Best of luck grower :peace:

Depending on the size of the grow and how much wattage being used, most growers should be able to maintain temps just by closing up and insulating the grow space/ limiting extracting for cooling. Most of the electrical equipment used (including lights) will generate plenty of ambient heat in...

Burn Barrels for inter-canopy heating/lighting :eyesmoke:

Why 5000K only if using 660nm? I get simplifying the design, but I would think you would want a more broad spectrum from white chips (regardless if mixing color temps or not) and supplement 660nm as necessary. Since most common spectrums are driven by 450nm pumps, I believe mixing the Evo...

These plants can definitely take more than 1500ppfd with CO2 supplementation. Most people touting that number have never grown at those light levels, and reference studies that are highly outdated. Fluence did a study showing cannabis yield increases up to 2500ppfd before photoinhibition set in...

I always cover my blue lab guardian screen. Like a flip down cover, something simple.

That is correct. Here is a study that was meant to dispel any ideas that chlorophylls or the epidermis reflect green light. “plant leaves are green because green light is less efficiently absorbed by chlorophylls a and b than red or blue light, and therefore green light has a higher probability...

More modern studies show the impact and importance of green light on photosynthesis, particularly at high light intensities and also in the lower canopy. Green light also penetrates deeper into the leaf tissue. This study talks about comparing red, green, and blue light to background halogen...

Not to be contrarian, but I don’t see any bud bleaching in any of those photos you posted. Some potential light stress, but not bleached buds. I don’t think gauging harvest times was part of the scope of their studies, though harvest times can be manipulated through means other than light...

I run (2) Fluence Spydr 2i fixtures @ about 1340W in 32sq ft. Basically 42W/Sq Ft

Ive grown under quite a few light light sources at different light intensities. I also happen to use Fluence R4 spectrum. To date, the best yields I’ve gotten were under that spectrum at high light intensities. Some tops we’re getting to 1700-1800 PPFD, but most were between 1300-1500 PPFD. I...

There is strong supporting research that total whole plant photosynthesis increases and plants have higher yields when grown under higher Max PPFD, so long as photosynthesis is not inhibited. So more yield out of the same grow space/same life cycle.

I would imagine that light spectrum/intensity would be more of a factor relating to plant morphology, assuming we are taking about a typical 16-18hr daytime period for veg. Longer days will typically need less light intensity, all other factors the same. Edit: this is why I mentioned varying...

The maximum amount of light a plant can use for photosynthesis before photoinhibition sets in, is dependent on many, many variables. This is why you will see different reports from different people. Mostly, folks will talk about light intensity or environmental conditions being the main...