“What led grow panel must i take advantage of for my licensed cannabis develop?”; “I’m comparing caused HPS for my cannabis operation. Which supply do you advise?” These are questions humans ask me nearly on a each day foundation. we’ve included this question in beyond posts on our weblog, like this one by our very very own head of advertising and marketing: led grow panel vs traditional grow light.

But maximum hashish growers recognize that this crop is distinct than maximum and plenty of growers have experimented with lighting technologies on a small scale to find they can once in a while increase terpenes and THC levels just via changing their mild assets. To begin, let’s unpack the facts that exists in this complicated topic.

There is a lot of data obtainable at the internet from various growers and led grow panel suppliers. You can find a contradiction to almost each point you locate! Most growers agree that for young flora through the veg stage of increase you’ll need to have a light supply with a very good quantity of blue light or maybe white (complete spectrum) led grow panel. the principle cause for this is to lessen internode stretching to supply a stockier, healthier plant.

After veg and transferring to flower, maximum growers additionally agree that switching to a light source with greater of the pink spectrum is higher for flowering. The vintage popular has been to apply both CMH or fluorescents in veg and switch to HPS into flower.

That is the attempted and genuine lighting fixtures recipe for indoor cannabis growers and through far the general public of cannabis produced in North the united states nowadays is grown in this manner. With the onslaught of LED lights manufacturers leaping into this new “green rush” of possibilities we are seeing this general lighting recipe being challenged increasingly.

Lighting and Hashish Traits

Maximum of these “new to horticulture” led grow panel manufacturers are making claims that you need to be the use of a full spectrum led grow panel in flower to truely maximize plant terpenes and THC stages. but is this absolutely authentic? See the graph underneath comparing what elements of the light spectrum is used for photosynthesis in comparison to the entire spectrum light from the solar.

These claims are not completely bogus but. We are now seeing actual outcomes that a chunk extra blue light in flower or on the very stop of the flowering level does growth terpenes/THC ranges. Relying on where you seek you will discover those quantities range from minimum 3-5% to unreal quantities of 26-38% as in this article provided by means of an led grow panel manufacturer.

As a plant that does not have sufficient lights in veg will now not produce as well in flower. That said, the spectrum with the maximum blue did produce the flower with the maximum terpenes and THC.

That is congruent with other findings that some brought blue in flower will motive this. But the motive we see these amounts range is because every strain reacts in another way to specific spectrums. Remember that the hashish plant grew in nature everywhere in the world at one of a kind longitudes with distinctive spectrums. With all the variations of cannabis traces in these days’s marketplace crafted from those ancestral plants from everywhere in the world, every will carry out in a different way underneath special spectrums.

Cannabis Research in Canada

In international locations like Canada, in which the federal authorities has legalized recreational cannabis, there’s the ability to do extra studies. The college of Guelph is one employer this is leading the way in this studies. As he states in this newsletter from HortiDaily — Michael Dixon, Director of Environmental manipulate research at Guelph says: “we’ve got found that the gold standard LED spectral recipe modifications with every strain of cannabis.” this is a totally critical announcement for growers to don’t forget!

Will you be developing simply one strain to your develop the whole time? If now not, what spectrum do you select? but if the added blue mild in flower simplest will increase your THC ranges by 4% is there a justifiable ROI inside the price of the added mild spectrum?? in that case, can you do that through simply adding a few MH lamps? Or does the ROI make feel to go all LED? (1000w DE MH lamps at the moment are to be had with the PL light NXT 1000w DE furniture).

The bottom line that i will proportion with you, from my attitude wherein i get visibility to masses of evaluations on the topic, see lots of income and growth cycles, talk to masses of growers, is that this: we are nevertheless within the investigative and improvement degree with LED era in this area.

LED generation has simplest been available on a industrial level within the horticultural enterprise for around 3 years. So realistically, they might most effective have had time to trial a constrained wide variety of spectrums that can yield desirable effects for one or strains/cultivars. We definitely have no longer had the era long enough to carry out the checking out wished!

What about developing in a greenhouse? From our graph above showing the spectrum of daylight as compared to that used for photosynthesis is there any gain for using a mild supply where you could dial inside the spectrum to feature extra blue?

The natural light received by using your crop in a greenhouse will cover all your light spectrum desires. So the massive question for greenhouse grows must center extra across the ROI comparisons among LED and HPS — not approximately light spectrum needs. This isn’t always some thing you’ll listen from mild manufacturers of LED lights. Your LED-handiest provider will have you ever believe you want their spectrum especially!

In terms of building an ROI comparing LED as opposed to HPS be cautious with effects which can be furnished by way of manufacturers of most effective one form of mild source. i have visible producers on both aspects of the argument control numbers to favor their specific light source. beneath is an outline of things to appearance out for when receiving an ROI comparing lights technologies:


With LEDs maximum will use μmol/J (“Micromoles consistent with joule” with joule being a measurement of watts). This is easy math you may do yourself.

To apply the PL light TopLED R/MB for example: 320W fixture with PPF of 860 μmol is two.7 μmol/J (860 / 320 = 2.6875) wherein the 1000W DE HPS has an output of 2100 μmol is 2.1 μmol/J (2100 / one thousand = 2.1). that is vital because i have sat in many shows, by means of LED manufacturers, who show how quick they are able to hit a good ROI with their LED and use 1.85 μmol/j as their HPS comparison.

They’re no longer lying about this but they are the use of the antique single-ended screw in 1000w HPS lamp inside the comparison. those lamps have an output of 1850 μmols at 1000w. however, it’s far an old generation only in use by means of small interest grows these days. i have seen manufacturers use as low as 1.7 μmol/J for HPS which would be the equal to the cease of lifestyles of the antique HPS technology.

Light Making Plans

while evaluating both technologies, constantly compare mild ranges of the complete grow and no longer just fixture to fixture. I can not pressure enough that there may be no such factor as a 1-for-1 substitute of HPS by LED! That in reality does now not exist inside the market. yes, there are LED furniture that exist whilst measured at once underneath the fixture.

The output seems same to or even greater than an HPS. but, when you pass the PAR sensor any route from targeted below the LED the light level decreases a whole lot greater below the LED than any HPS fixture! Always ask for a mild plan that suggests a mean mild stage in micromoles AND a uniformity average (with any luck above 90% uniformity). Maximum LEDs are a totally directional source of lighting.

If a crop is grown below lighting fixtures that is not uniform throughout your cover however alternatively has “warm spots” and “dark spots” it’s going to purpose you problem as the new spots will use extra water, evaporate water, soak up nutrients, and so on. at a one of a kind rate of velocity then the dark spots! To actually have an “apples to apples” assessment be sure to evaluate mild plans with the equal targeted mild stage in micromoles and close to the identical common uniformity number. If a dealer cannot provide you with these numbers then it may not be someone you need to be considering.


Any other location you need to always do your personal math on is the BTU calculation in your grow room. sure, LEDs produce less heat than HPS and this can be the identifying aspect. as the fee to chill your develop room can be considered one of your maximum manufacturing prices.

Your AC load is primarily based on the quantity of BTUs constructed from your furnishings. This is straightforward math as 1 watt equals 3.412 BTUs. no matter what 1000w HPS fixture you operate the BTUs from that fixture might be 3412!

Try this math together with your LEDs as well. The PL mild TopLED is 320 watts so the BTUs might be 1092 BTUs. while that seems like a huge financial savings it will take as a minimum times the quantity of our LEDs to get to the identical mild level as a 1000w HPS.

On the opposite facet of this argument is that the LED fixtures do now not provide the radiant warmness as HPS and your crop roots will perform higher with warm temperature. it’s miles demonstrated that there may be an instantaneous correlation between warmth and crop production. plants develop slower, producing much less fruit the colder they’re. In northern climates many growers depend upon the heat from HPS to warm their vegetation.


That is a massive attention to keep in mind when comparing these technology. there’s no smooth math to calculate an ROI for this but when evaluating light plans from one supply of mild to any other make sure to take into consideration the space of the mild source from the canopy.

There may be a big misconception within the enterprise stemming from the LED providers that the capacity to have your LED lighting fixtures a lot toward your crop will help boom production decrease into the crop.

This could not be in addition from the fact! whilst your mild source is towards the pinnacle of the cover than the shadows comprised of the top layer of leaves are a lot bigger than if the mild turned into in addition away. (Use a flashlight and make a shadow on a wall together with your hand. Watch how the shadow grows as you get the mild towards your hand). also, mild penetration into the crop comes from the crossover among furnishings.

HPS or LED: A Key element to remember

One of the motives you continue to pay attention human beings claiming that LED isn’t always ready for industrial hashish grows is because the reflectors from an HPS fixture installed four ft from the cover will provide a huge perspective of mild so the crop will acquire mild from the fixture at once above as well as the lights from the following row over and even 2-3 rows away.

LED Grow Panel or HPS Grow Light for Growing Cannabis?

This light is coming in from unique angles hitting the crop below the cover leaves that are causing shadows from the mild above. this doesn’t happen in case you are the use of an LED fixture that is a big panel of LEDs or made of multiple LED bars in which they need to be mounted 9-12 inches from the canopy. You get no crossover from the fixtures however simplest shadowing from the top of the canopy.

It become only after organizations like P.L. mild and Philips* added LED fixtures specially engineered for truss mounting in a greenhouse, that growers surely followed this technology. these merchandise enabled even the indoor grower to maintain a long way between the LED fixtures and the plant cover, and resulted in manufacturing much like growing below HPS. (*inside the usa, Philips has taken the stance that they may now not help income into the cannabis industry because it isn’t always identified to be criminal with the aid of the federal authorities)

With all of these elements above, how do we solution our preliminary questions?? quite frankly, there may be no easy answer! every develop is different – from different: traces being grown, growing climates by using geography, fashion of growers, indoor as opposed to greenhouse, and many others. All of those factors will weigh heavy on what is higher for you!

The excellent recommendation i have is to get a contrast of your ROI achieved by using a versatile enterprise. One which can provide both technology where you could have light plans designed to the identical levels with each technologies.

Don’t trust simply what the LED man says or the only HPS guy says. observe each, do your own math. realize what works for the strains you are growing and degree your very own ROI. the easiest way to do this is going to this link and ask your neighborhood PL mild Territory supervisor for recommendation as we are the “lights understanding agency” and whether or not you make a decision to use LED or HPS, you will get a real and sincere comparison of both technology.