What Is the Most effective LED Spectrum for Marijuana Developing?


It is an thrilling time to be a industrial grower. With the most up-to-date advancements in LED technologies, you have additional manage more than your yields than ever just before. Variable spectrum LED lights like the California Lightworks SolarSystem® let you to mimic the light spectrum of the sun and command the altering seasons . . . at least in terms of your plants’ perception.

Your cannabis plants are covered in photoreceptors—light sensors that choose up signals from the light they acquire. Plants use these photoreceptors to study the light spectrum and make choices primarily based on what they study about their present circumstances.

It all comes down to the position of the sun. The sun’s proximity to earth modifications with the seasons, and the concentration of diverse colors on the light spectrum modifications with it. For instance, as fall approaches, the sun sits reduced in the sky, escalating the intensity of red light. A plant’s photoreceptors take that greater concentration of red as a signal to get started creating as lots of buds as doable just before winter sets in.

By very carefully adjusting the spectrum for every single stage of the development cycle, you can boost your yield, boost potency, and eventually boost earnings.

You just have to know how and when to adjust your LED light spectrum.

Irrespective of whether your operation is indoors or in a greenhouse, right here are some pointers to get you began.

How the Light Spectrum Impacts Marijuana Plants

When we speak about light spectrum, we’re speaking particularly about the distribution of red, blue, and UVB light. So the 1st point to realize is how every single colour influences your cannabis plants. In the most simple terms:

Red light promotes flowering. Having said that, it also encourages vertical plant development. Also significantly red at the incorrect time will result in your plants to stretch, which outcomes in reduced yields and lanky, unstable plants.

Blue light is your secret weapon for amping up the concentration of oils and resin.

UVB light puts your cannabis on the defensive . . . in a superior way. Just as we humans do, plants actively guard themselves from the sun’s UVB rays. But rather of sunblock, they make additional trichomes, eventually escalating potency, flavor, and fragrance.

Now, let’s speak about when to use which colour spectrum.

The Most effective Spectrum for Developing Cannabis Indoors

The spectrum you choose tells your marijuana plants what to do when by guiding them via the seasons. If you are expanding indoors, you have to totally recreate the sun for your plants via variable spectrum LED develop lights.

Here’s what a common development cycle really should appear like.


If you are beginning from seeds, you want to give your seedlings 24-hour light, but at low intensity. Stick to about 15% red and 30% blue and white. When your seedlings get their 1st set of accurate leaves, you can double the intensity till they have additional than two sets, at which point they’ve graduated to the vegetative stage.


If you are beginning with clones, your 1st target is to encourage rooting. This requires some work on your plants’ component, so retain the light intensity low. If you stick to about 25% red and 45% blue and white, your cannabis is additional probably to concentrate power on deepening roots rather than expanding upward.

Vegetative Stage

In the vegetative stage, your top rated priorities for your cannabis plants really should be root development and building good, tight internodes. For this, a healthier dose of blue light is your most effective bet. A greater concentration of blue keeps plants a tiny shorter. You do not want your plants to shoot up also quick, create longer internodes, and make a scenario in the flowering stage exactly where taller leaves kind a canopy blocking light from the buds that develop reduced on the plant. Preserve your blue and white light levels blasting at 100% and retain red at much less than 60%.

Pre-Flower Stage

The pre-flower stage is when you really should get started prioritizing bud development. Don’t forget how plants take the red-light signal from the sun to get started flowering? That is the all-natural reaction you want to tap into now. An boost in red will inspire your plants to sprout buds.

Having said that, you do nonetheless want to be cautious of bathing your plants in also significantly red. You really should steer clear of flowering stretch at this stage, and red light does have a tendency to make plants attain skyward. At pre-flower, your wisest move is to kick the intensity of red light up just a tiny, to about 80%. Your blue light concentration can stay correct exactly where it was.

Flowering Stage

This is the red spectrum’s time to shine, so to speak. Up till now, you have been shielding your plants from a blast of red light to stop stretching, but now your marijuana desires all the photons it can get. Turn your red light spectrum—that’s red and deep red—up to 100%. This maneuver aids you get these greater-than-ever yields.

The rest of the channels in your variable spectrum can remain at 100% as effectively. It is all hands on deck in the flowering stage.

Finishing Stage

This is exactly where you handle your potency and chemical profile. As you recall, blue and white light are the heroes when it comes to creating trichomes. Prioritize blue and UVB at 100%, and turn red down to about 50%. This is how you get these sticky buds absolutely everyone is hunting for.

If you are new to variable spectrum LED lights, this might appear like a lot to handle. Thankfully, you can essentially plan and automate the whole development cycle with technologies like the SolarSystem® Controller.

Of course, this is all strictly indoor lighting. If you are expanding in a greenhouse, the considerations are a tiny diverse.

The Most effective LED Spectrum for Developing Cannabis in a Greenhouse

If you develop cannabis in a greenhouse, you do not will need to bathe your plants in complete spectrum light rather so usually. The sun does a lot of the heavy lifting, so you only have to supply supplemental light.

The advantage of greenhouse expanding is that you devote much less dollars powering your lights, because they do not have to be on at complete intensity practically as usually as they would indoors.

What tends to make greenhouse expanding a tiny additional difficult, nonetheless, is that you have to do some calculations to figure out the balance involving how significantly of what sort of light your plants are obtaining kind the sun and how significantly artificial light you will need to add in.

It is not possible to supply any really hard and quick guidelines for you in a single report, mainly because your desires rely on lots of variable elements. Exactly where is your greenhouse positioned? What season is it? How extended are the days in your area?

A single point that will assist is to refer back to the guide above for indoor lighting. The variable development cycle spectrum laid out there tells you what your plants will need at every single stage of development. Then you can function out how significantly supplemental lighting you will need to supply to enhance your yields and get the item you want.

A couple of other elements to take into consideration:

  • Seedlings do most effective with 24 hours of light.
  • In the vegetative stage, your plants will need about 18 hours of lights on, six hours of lights off.
  • For flowering, you really should switch to a 12 on, 12 off schedule.
  • In each phase, your plants will need six hours of direct, complete spectrum light every single day.

If your plants are not obtaining all the light they will need, they’ll let you know by expanding an excessive quantity of leaves. A lot more leaves aids them choose up additional light. If you see additional leaves, it is time to boost the supplemental lighting.

A single final tip for greenhouse lighting: Make positive you pick supplemental LED lights that are created particularly for greenhouse use. You want fixtures with a slim profile to reduce shadowing. If your LED lights are blocking your plants from the sun, there’s not significantly point in possessing a greenhouse operation to commence with. We advocate checking out California Lightworks’ GH Pro 340.

The rewards of operating with variable spectrum LED lights are enormous. You can enhance yields, make an even greater high-quality item, and drive earnings via the roof.

If you haven’t worked with these varieties of lights just before, there can be a bit of a understanding curve. If you really feel lost, do not be concerned. We’re generally satisfied to assist you take a appear at your indoor or greenhouse setup and assist ascertain what’s most effective for your marijuana crop. Speak to us anytime, or discover your LED lighting possibilities right here.


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