Thinking about growing cannabis? Here’s why you should consider LED lights and how you can use them. Find out how to germinate cannabis seeds with our different techniques and quick & easy guide. You might be surprised to know… When cannabis seedlings have grown their second or third set of serrated leaves they are usually hardy enough to flourish in direct sunlight. Learn when that is and how to do that now.
How to Grow Cannabis Using LED Lights
It used to be that lighting was one of the most expensive aspects of growing marijuana. A good set of HID or CFS lights could set you back a couple hundred with all the required equipment. Now, thanks to LED lights , cannabis grow lights are much more affordable, making growing cannabis at home much more attainable.
Growing Cannabis Using LED Lights
Related: 4 Best Grow Tents for Growing Marijuana
Different Types of Cannabis Grow Lights
The main types of cannabis grow lights are HID, or high-intensity discharge, CFL or compact fluorescent lights, and of course, LED or light-emitting diode lights. HID lights were the most commonly used cannabis grow lights when indoor growing first became popular in the 1990s. This was because they produced just the right number of lumens to grow cannabis indoors.
Though they work exceptionally well, HID lights are not without issues. For instance, a good setup is very expensive. If your plants don’t produce to your liking, you could find yourself out a few hundred dollars with no way to make your money back.
Those who could not afford a good set of HID lights would resort to CFLs, which, while not as effective during the flowering phase , managed to get the job done most of the time. Often times, these were the only options for growers with smaller operations, or those growing a couple plants for personal use. CFLs have gained some popularity over the years, but they would never be as popular as HID lights, which are trusted by growers all over the world. That is until LED lights entered the picture.
Why Use LED Lights?
There are many reasons to use LED lights when growing cannabis.
For many, the main reason is that they are relatively inexpensive when compared to the much pricier HID setup. This is especially true if you are growing a smaller number of plants. Our grow lights at A Pot for Pot are specifically designed for growing a small number of marijuana plants and is priced well under $200 – proof that high-quality lighting doesn’t need to be expensive.
This was not always the case. When LEDs were first gaining momentum among growers, the technology was still fairly new and had not entirely been perfected. Think about how expensive and inconvenient cutting-edge technology like smartphones were when they first came out, and it often wasn’t worth it. For example, many agree that the first-generation iPhone was not the greatest. However, today’s smartphones are much more affordable, and they are everywhere.
Energy Savings and Privacy
Another thing to consider is how much money LED cannabis grow lights will save you on your energy bill. HID lights are good at what they do, but the amount of energy they use will cause your energy bills to skyrocket. This not only hurts your pocketbook, but it can also draw unwanted attention in your direction either by a landlord, a nosy neighbor, and/or the police. When people had to keep their marijuana growing activities under wraps, spiking electricity bills often gave them away. While cannabis is legal in more areas now, this does not necessarily mean that you want the whole neighborhood knowing what you are up to.
Reduced Water Usage
Not only are LED lights more energy-efficient , but you’ll also save on water usage as well. As you are now aware, HID lights use a lot of energy, which in turn produces more heat. This dramatically increases the temperature of the grow room, causing your plants to consume more water. Cannabis is already quite the water hog when compared to other plants and growing even just a small amount of plants uses a lot of water. Any way to reduce water consumption is great for the environment, not to mention great for your utility bill.
Finally, LED lights last longer than HID or CFL bulbs, ensuring many years of good use before they need to be replaced. Traditional cannabis grow lights last for only 20 thousand hours. In contrast, LED bulbs last more than twice as long, for up to 50 thousand, or sometimes even 100 thousand hours. That’s five times the life of HID lights!
Convinced? Check out A Light for Pot to start growing cannabis with LED lights.
Start Growing with LED Lights
Cost is not the only reason to make the switch to LED lights . Experienced growers know that seedlings and plants in the vegetative stage benefit more from blue light, while flowering plants need red light to thrive. Before LEDs, growers would have to purchase two different types of lights: metal halide for the vegetative or blue light stage, and high-pressure sodium bulbs for the final flowering stage.
With LED cannabis grow lights, this is not the case. Different color LED bulbs give a grower the ability to manipulate the color spectrum, thus allowing you to use the same light setup for both phases of growth. This not only eliminates the need to purchase two different types of lighting setups, but you’re also guaranteed the best results in your plants!
The benefits of using LED cannabis grow lights are many. The next big question is how to grow marijuana using only LED lights. A good rule of thumb is one light per every 1.5 square feet. This generally will yield you up to 6 ounces per plant, which ends up covering what you spend on the light and will definitely end up saving you money in the long run. If you are growing only 1-2 plants, our single 75 watts LED light supplies plenty of light for your plants.
Even if you’d like to grow more than a few plants, you don’t have to go for the more expensive HID lights. Simply add to your setup with either a few larger LED bulbs or several of the smaller ones. If you opt to go for the latter option, make sure that your plants and your lights are spaced out correctly, as you want to make sure that each plant gets adequate amounts of light. Using too few lights can cause stretching, whereas using too many lights leaves you at the risk of light burn, as well as energy overconsumption.
If you are willing to step up the quantity of your grow, that is, really take it to the next level, you should be prepared to spend a little bit more cash. A large scale 350-400 watt LED operation that will outdo the average 600 watts HID lighting system is not going to come cheap. However, a larger LED light setup will still be more cost-effective than an HID setup of the same size.
Related: Smell-Proofing Your Indoor Marijuana Grow Room
Drawbacks to LED Lights
If there is one drawback of using LED grow lights, it is that your plants’ grow time will be slower than if you were using HID lights. Again, this is because HIDs emit more energy than LEDs, leading to faster flowering.
You should also be aware that while LEDs don’t put out as much energy, your plants are still susceptible to light burn. So, like any other lights, make sure that you are keeping your lights a proper distance from your plants and keep plants dry when under direct light.
With LEDs, you don’t have to place your plants as far away as you would with HIDs. Keep lights below 300 watts about 30-70cm away, or just around 12-27 inches. Lights above 300 watts should be kept at 70-80cm away, while gradually decreasing space when flowering. Larger wattage like 450 should be close to 80 cm or 31 inches.
Be careful when making any changes to your light setup. Decreasing the space between plant and light too quickly might have detrimental effects. Keep an eye on your plants and take it slow!
How to Germinate Cannabis Seeds (Quick & Easy)
Getting cannabis seeds to sprout is known as germination. In nature, this happens underground, but it isn’t an entirely reliable process in a well-organized grow-op.
In the case of cannabis, it is often better to germinate a seed before planting to ensure that the plant will indeed grow and eventually lead to a successful harvest.
Duds are a common issue, even with quality cannabis seeds. Taking care to rear these fledgling plants in a more controlled environment than dirt can help reduce the amount of non-sprouting seeds and save the grower from some amount of disappointment.
There are a few techniques to consider when germinating cannabis seeds.
The 3 Common Methods to Germinate Cannabis Seeds
Cannabis seeds only need three ingredients to be able to grow: heat, water, and air. Anything that provides those will result in a sprout, as long as the seeds are viable, so some precautions should be taken when storing seeds in warm or humid climates.
Photo by lovingimages on Pixabay
The following methods are all tried and true alternatives to the direct planting of the seeds. However, growers should take note of the color of their seeds before attempting any germination, as immature seeds will not be successful.
Always avoid seeds that are light green, as they have not aged long enough to sprout. More mature seeds are darker in color and almost brown.
1. Paper Towel Method
This technique is really popular and recommended even for the most novice of growers.
Simply take the seeds and place them between a couple of wet paper towels. Next, take the towels and put them between two plates to create a sort of protective, dark dome. Finally, make sure it all stays relatively warm (70F-90°F) and after several days the seeds will begin to sprout.
They may end up soaking up more moisture than expected, so be sure to check on them throughout the process and add more water if needed. Not too much though, just enough to keep the paper towels damp.
2. Soaking Overnight
When older, dried out seeds need to be revitalized, a good soak can wake them up when done properly.
Place the seeds in a glass of warm water, move them to a dark environment, and within about 24 hours, the taproot should begin to poke through.
If it has not, the seeds should be moved to a different environment as too much water can drown them. 24-36 hours is the maximum recommended time for this and is only needed on seeds that have dried out for a long period.
This is slightly riskier than the paper towel method because of the aforementioned risk of drowning, but it has the potential to revitalize older seeds.
3. Peat Pellets
The concept here is to use a piece of growing medium, such as widely available peat pellets, and to plant the seeds directly into it.
Soak the pellets in warm water and then poke a small hole into them, about a half-inch deep and just big enough for the seed to fit snugly into. Here, they can be watered, kept warm, and even begin to take root. The whole pellet will eventually be transferred to wherever the germinated plant will be grown.
Setups involving many pellets on a warming rack are colloquially known as “germination stations” and are very commonly used in both amateur and professional grows. Very little trauma to the seed can occur here, and the trauma of transplantation becomes a non-issue.
- Once the seeds have begun to split the seed and the white taproot begins to reach out from within, the seeds are ready to be planted.
- Small pots are recommended for this stage; these should be prepared with soil before transplanting.
- Poke a hole into the soil, about a half-inch down, and gently place the germinated seeds into the ground. Tweezers work well here since they are very delicate at this stage.
- If using the peat pellet method, that can be planted with the seed, which reduces the risk of any mishaps during this process.
- Once transplanted, the soil should be watered with something like a spray bottle or mister to gently saturate the ground, as too much moisture can be detrimental to the seeds.
- See also:5 Best Soils for Growing Cannabis – Reviews & Top Picks
After a few days of being kept moist, and at the correct temperature, a sprout should poke its way out of the ground that is ready to be grown.
When can seedlings be put under lights or in the sun?
Not sure whether to grow your cannabis seeds in the sun or under lights? This article explains how much light you need, how to prevent your seedlings from falling over, and when to plant them outside.
“When can cannabis seedlings be put under lights or in the sun?” is a common and sensible question that is often asked by novice cannabis enthusiasts after germinating seeds indoors under lights.
For those who are growing indoors, cannabis seedlings may be put under lights as soon as they emerge from the soil or growing medium.
How much light for cannabis seedlings?
When using HID lighting (usually a metal halide lamp), young seedlings should be kept at least 50cm from the bulb.
With compact fluorescent lamps (usually 100w or more), a distance of around 15cm should be maintained between the top of the young seedlings and the bulb.
If using normal fluorescent tubes (18-36w), seedlings can be kept within a few centimetres of the light source.
Cannabis seedlings growing under lights should always be given a gentle breeze from an oscillating fan (a small household fan on the lowest setting is fine), as constant gentle movement will strengthen their stems significantly.
Are your cannabis seedlings falling over?
If cannabis seedlings grow tall and then fall over, this is almost always a result of growing in an environment with static air.
Seedlings intended for outdoor growing should be kept by a sunny window for the first week or two after emerging from the soil.
When they have grown their second or third set of serrated leaves (after the the round cotyledons that initially emerge from the seed) seedlings are usually hardy enough to flourish in direct sunlight.
When to plant your cannabis seedlings outside?
If outdoor temperatures are suitable, seedlings may be acclimatised to direct sunlight by giving them progressively longer daily exposure to outdoor conditions.
Starting with about three hours outside, at the sunniest time of day, seedlings can be given an extra hour of outside exposure each day, so that within about two weeks they can be left outdoors permanently.
Laws and regulations regarding cannabis cultivation differ from country to country. Sensi Seeds therefore strongly advises you to check your local laws and regulations. Do not act in conflict with the law.