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How to Choose the Best Cannabis Grow Lights

Thu, 08 Dec 2022 02:10:23 +0000

Every cannabis grower wants to produce the highest quality product possible. With light being a crucial factor in plant cultivation, part of optimizing the process involves using the ideal cannabis grow lights. Choosing the right lights can be tricky as there are multiple types to choose from, each with their pros and cons. What’s more, rapid advancements in research and technology means it can be tough to stay on top of the most up-to-date information.

Armed with the right knowledge, however, any grower can be well-equipped to make a solid decision based on your unique situation. Factors to consider include cost, power consumption, heat output, and light spectrum. And the choice will be different depending on the types of plants you’re growing and the space you’re working with.

In this article, we’ll help ensure you choose the right lighting setup that fits your needs and budget. We explain the different types of lights available, reveal key factors to consider, and discuss recent advancements in the field, so you can make the right decisions.

Types of grow lights available

There are really two main types of light on the market today: LED (light emitting diode) and HID (high-intensity discharge). LEDs are newer and popular due to their efficiency and other factors.

“HID lamps are incredibly inefficient, which is why they generate so much waste heat,” Taylor Kirk, horticulture services specialist at Fluence by OSRAM, tells Analytical Cannabis. “In comparison, LEDs are nearly twice as efficient. They also last two to four times longer than metal halide or fluorescent fixtures and do not require bulb changes, which reduces operating costs in the long term.”

Kirk also notes that LEDs offer more control over light spectrum and intensity without color filters. This enables growers to better manipulate plant morphology and the metabolic processes that determine flower yield and quality.

But while LEDs are increasingly common, HID bulbs are still broadly used. There are two main types of HID: MH (metal halide) and HPS (high-pressure sodium). These are often used in combination, because MH bulbs – which produce a bluish light – are good for vegetative growth, while HPS lamps – which produce a yellow-orange glow – are better suited to flowering plants.

Factors to consider when choosing the best grow lights

As Brendan Delaney, director of cultivation at Solar Cannabis Co., explains, there’s a lot that goes into the decision-making process when choosing which type of light a grower should use, including the cost, quality, intensity, and desired spectrum.

Here we’ll go over the main factors to consider when choosing grow lights:

Cost and efficiency
Facility layout
Light spectrum

Let’s look at each of these in detail:

1. Cost and efficiency
In general, the cost to purchase HIDs is lower than for LEDs, but prices on LEDs are decreasing. Plus, many companies offer rebates, helping to offset the upfront costs. But when calculating capital expenditure, you also must consider the net running costs of lights, including how much power they consume and how much heat they give off.

“Plain and simple, LEDs are extremely energy efficient,” says Delaney. “When talking about efficiencies, it’s not just about the light itself but more in terms of environmental variables. LEDs throw off considerably less heat than other lights, such as HPS. This has a dramatic impact on cutting cooling costs, making it more efficient all the way around.”

That said, as Kirk notes, some growers rely on the heat from HID lamps to provide warmth to their facility. “If a grower is replacing HPS lamps – which often provide heat for the grow room due to their low efficacy – with LEDs, which run cooler, they’ll need to properly compensate by adjusting the HVACD [heating, ventilation, air conditioning, and dehumidification] system to add heat to the room.”

2. Facility layout
Another key consideration is the space that cannabis cultivators are working with. With vertical farming increasing in popularity, growers are now able to produce high yields within a limited footprint. Plants are grown in tiers, which means a multi-level lighting system is required to supply all plants with the right amount of light.

HPS lamps are usually unsuitable in this scenario, as they tend to be large and give off a lot of heat. On the other hand, LEDs have a slim profile, fit easily into racking systems, and don’t emit much heat. As such, they can be strategically placed to ensure that all plants have the right amount of light, no matter their position on the racks.

3. Light spectrum
Plants require different levels of light intensity and spectrum composition depending on their cultivar as well as their stage in the growing cycle. Recent advancements in research mean that lighting manufacturers and growers are now equipped with more in-depth knowledge in this area and are tailoring lighting systems accordingly.

As mentioned, LED lights offer more control here, but not all LEDs are made equal. This is definitely an area where you need to do some research and find out what the different lighting manufacturers are able to offer.

As Delaney reveals, “When you’re looking deeper into the light spectrum, we’re really starting to see companies experiment more in-depth with diodes, adding deeper reds and more UV at various stages. With these initiatives, we’re seeing better results with higher yields. It’s still early on, but this is a big trend within the market.”

Indeed, Kirk tells Analytical Cannabis that research by Fluence – conducted in partnership with Wageningen University and Research in the Netherlands and Texas Original Compassionate Cultivation – found that, in some chemovars, monoterpene and cannabinoid content were inversely proportional to the fraction of red light introduced to plants. As such, cultivators need to pay particular attention to their spectral composition.

Kirk notes that recent cannabis lighting research has also delivered another critical insight: that most cannabis cultivars perform well under high photosynthetic photon flux density (PPFD), creating potential to maximize yields without jeopardizing quality.

“These insights together show how important it is for growers to adopt a high PPFD lighting strategy with a more balanced ‘white light’ spectral composition,” remarks Kirk. “This will result in significantly higher yields, better crop morphology, and improved cannabinoid profiles.”

Final comments

Overall, when deciding on the right lights, growers need to establish their key objectives. For example, Kirk notes that “for those who want greater environmental control or need to introduce new spectra and light intensities to optimize plant attributes like morphology, cannabinoid content, and overall yield, LED Grow Lights should be the first option.”

That said, cost is often top of mind for growers and HIDs can sometimes win out here. Just remember to factor in all long-term expenses including the upfront price, utility fees, and replacement costs when calculating expenditures.

LED Lights For Growing Indoor Marijuana

Tue, 20 Feb 2018 02:13:52 +0000

When creating an indoor setup for growing marijuana, one of the most important decisions is what kind of lights to use. In this article, we’ll cover a few of the different options and details about LED lights.

LED grow lights have not always been popular with marijuana growers. However, technology has improved, and so have LED lighting systems. Although they would not have been a reasonable choice for marijuana growers five or ten years ago, they are becoming more popular every day. We can now find LED lights not only in the marijuana grow room, but also in cars, offices, and homes.

Many people swear by LEDs instead of HID setups, asserting that they are a far superior and more energy conscious option. If you go with LEDs, you will save energy, money, and management time.

The advantages and disadvantages of using LED lights

While LEDs sure sound amazing at first, this does not necessarily mean that they are the right light choice for you and your indoor marijuana grow setup. Let’s go over some of the major pros and cons that come with using LED lights.

Advantages
First and foremost, the energy savings are enormous. If you compare using an LED light for the same purposes as you would an HID light, using the LED light will save you about 40% of the energy consumption. They also last a lot longer. You can expect between 50,000 and 60,000 hours of working use of an LED light, compared to between 2,000 and 3,000 hours with an HID light. This is because LED lights don’t have a filament to burn.

LED lights take up less space, emit light faster, and are more durable and shock-resistant than HID lights. They also have a much lower heat output, therefore lowering the need to keep your grow room cool. This reduces the risk of fire significantly. HID lights will become very hot, but good LED lights feel cool when you touch them, even after running for several hours.

LED lights focus using the lenses, which means there is less of a need for reflectors like HID lights, which disperse the light without focusing and, therefore, need an external means of focusing. HID lights need approximately 100 to 150 Watts of more power than LED lights since there is power management built into the LED lights. HID lamps require external ballasts and, therefore, add extra watts of consumption.

LED lights turn instantly on and off, unlike HID lamps, which need to warm up before being fully lit. LED lights can even be dimmed quite easily. Classified as “Class 1 LED product,” LEDs are considered a safer lighting option. This is because they don’t have mercury like some other lights, such as compact fluorescent bulbs (CFLs).

The efficiency of LEDs is particularly noticeable when compared to CFLs. You can expect to save about 50% of your energy bill when you choose an LED over a CFL.

Disadvantages
When using LED lights, precise power (current) management is necessary. Additionally, LED lights have higher upfront costs. That being said, they are less expensive over longer periods of time. LED lights particularly need more specific current and heat management than do HID lights, when they are powerful lights to be used to light entire large areas.

LED lights vs other lights

One of the biggest questions to consider is whether you should choose an LED light setup or one of the other options for an indoor grow setup. How do LED lights measure up to other types of grow lights? Let’s look at the differences in lighting.

LEDs vs. CFLs

The most common light that has been traditionally used to grow marijuana is the CFL. CFLs are tried and true, having been used for generations, causing many growers choose to go with them, despite the fact that LEDs are often hailed as a more efficient technology. For people who have properly done their research on lighting systems, LEDs are almost always the winner. While CFLs needed to be adjusted pretty much on a daily basis, LED lights do not need this frequent maintenance.

LED lights also do not release the large amount of heat that CFLs do. They are well-equipped with cooling systems such as fans or heatsinks as well, which allows for an easier time of keeping the grow room at a temperature that isn’t too high (for the plants as well as the grower).

That all being said, there are some situations where using CFL lights makes more sense. One such situation is if your indoor growing area is on the shorter side. This is simply because LED lights need to be kept further away from the plants than CFLs do. Generally speaking, LED lights should be between twelve and eighteen inches above the canopy of your plants (although this should be cross-checked with the specific manufacturer) while CFLs just need a minimum of a few inches.

LEDs vs. MH/HPS

While many growers choose either LEDs or MH/HPS lights, the fact is that combining the two might provide the most advantageous setup you can find. Without the scientific evidence to prove it, many growers will swear that HPS lights turn out much prettier buds while LEDs get them to be denser and more potent. Therefore, using both should give you the best of both worlds.

Many growers have specific requirements for their situation that make either LED or MH/HPS lighting a more logical choice. For instance, if you are trying to keep the upfront costs of your grow room as low as possible, using an HPS grow light during the flowering phase makes the most sense. If you compare electricity used to the resulting yield, MH/HPS lights will give you the best bang for your buck. Electricity aside, they also simply cost much less than LED lights.

There is also a higher degree of variability with LED lights. If you buy LED lights, you must always check the manufacturer’s information to know what “rules” to follow. MH/HPS lights, on the other hand, are highly standardized and the models all fall into the same category of rules for the most part.

Many assert that LED lights get a better quality bud than MH/HPS lights, however. More trichomes, greater potency, and a stronger natural taste and smell are all associated with using LED lights.

How do LED cannabis grow lights work

Most simply, LED lights use a current passing through a semiconductor to produce light. The energy (in the form of light) is released from moving electrons inside the semiconductor. They used to only be available in the red, but now they are available in any color, ranging from ultraviolet to infrared wavelengths.

The invention of LED lights is credited to H. J. Round, a British man from Marconi Labs who, in 1907, was the first to experiment with, and observe electroluminescence. Fast forward twenty years to when the actual invention of the first LED light finally came about. But even the Russian inventor, Oldeg Vladimirovich Losev, couldn’t find a practical way to use the light. It wasn’t until 1955 that Rubin Braunstein observed semiconductor alloys, and six years later, Texas Instruments took over with a patent.

LED colors
LED colors are made via electronic action occurring at the p-n junction. This junction is where the n-type and p-type semiconductor materials emit energy, resulting in the color of the light. This light wasn’t even observed until 1962, when Nick Holonyak, Jr., working with General Electric, witnessed the red LED light. His graduate student, named Craford, then invented the yellow LEDs and also made the reds and orange LEDs ten times as bright by the year 1972. Blue and white followed similar development, via other experimenters and companies.

The different colors of LED lights actually stimulate and trigger different types of growth in marijuana plants, for example:

LED lights within the blue spectrum spur vegetative growth.
LED lights within the yellow, amber, red, and far-red spectrums spur pre-flowering and flowering stages, which includes reproductive growth.
Generally speaking, using lights to grow marijuana indoors can be successfully done from sprout to harvest by using between 420 and 730 nanometers (nm). Therefore, if you want to grow marijuana that ends up with a successful yield, you will need LED lights that include and use the full spectrum.

If you choose an LED light that has only red or blue lights, it simply will not get your plants to grow to their full potential, like a white LED light (also known as a full spectrum LED light) would. White LED lights contain closer to the full spectrum, making them more similar to the sun than single color LED lights. Even red and blue lights together will not do it. You need white LED lights.

So what exactly are the other types of LED lights, such as the 3, 5, 6, 11, or 12 band LEDs that are advertised? These LEDs have a spectrum that includes those gaps. They might be 440, 470, 525, 640, 660, or 740 nanometers. These lights do not offer the same full spectrum that a proper white LED light would provide.

Instead of white LED lights, you will often find many different diodes on store shelves, or online. Some claim to be able to match the PAR spectrum more accurately than a white LED. When you shop for an LED light for your marijuana plants, you should be aware of the exact spectrum that it covers, and know whether it coincides with the PAR spectrum as closely as possible.

The fact about the PAR spectrum is that the better an LED light matches it, the more efficient the light will be. Less light will be wasted since there will be a higher ratio of usable light for your marijuana plants. This helps marijuana growers save on their power bill while simultaneously spurring better growth in your plants. There is also less heat loss, which means cooling your grow room is much easier with LED lights.

Thermal management of LED grow light
LEDs don’t get as hot as other types of lights, and they are also far more efficient than other lights. This efficiency is because they don’t burn filament. The vast majority (95%) of an HID lamp’s energy is actually wasted as heat or radiation, therefore reducing its efficiency significantly. Since LEDs are generally cooler in temperature, they waste far less energy as heat.

When using LEDs or HIDs as grow lights, it’s important to take these heat differences into account. HIDs need to be situated several feet above the tops of your marijuana plants, for example, while LEDs can be kept really close to them (between one foot and 18 inches).

This does not mean, however, that LEDs have absolutely no heat issues associated with them. While they don’t feel warm because they aren’t emitting infrared radiation, the high powered LEDs are actually less efficient and, therefore, waste more heat than low powered ones.

If you have high-quality LEDs, they should have heat sinks that keep the heat under control. These heat sinks allow for the dissipation of unwanted heat. Any LED lights that are below 700 watts should use heat sinks to cool them. For high powered LED lights, heat sinks should include aluminum, copper, thermoplastics, or even graphite (for the most expensive option). A large surface area is required for the heat sinks to work efficiently, so don’t be surprised by odd fin shapes designed into some of the more expensive lights.

Because of the requirement for a large surface area, heat sinks will not be as practical of an option for the largest LED lights on the market. Therefore, some of these larger lights use passive heat sinks combined with fans to keep cool, although the best designs don’t need a fan at all because the sinks work well enough.

Whatever type of cooling system your LED light has, make sure it is high in quality. Low-quality cooling systems will cause your LED lights to deteriorate fast, so it’s better to pay the higher upfront costs to get your money’s worth in the long run.

The LED lens
Cannabis LED grow light lensOne of the best qualities of an LED light is the fact that external reflectors are not needed to focus the light on one area efficiently, unlike HID lights. Instead of requiring these reflectors, LEDs use a lens to focus their lights onto a smaller area in full force. The plastic shell holds together the entire LED system: the “chip” that sits in the potting, which also serves as the lens for your LED, boosting the light out of the semiconductor. Depending on the quality of the way the chip was “potted,” the light output can vary considerably between cheap and very expensive options.

Remember, the actual extraction of this light is equally important to the type materials being used for the semiconductor. This is why sometimes people prefer to purchase reflectors even though they have LED lights. Reflectors don’t need to be complex to be effective. If you are getting a lens instead, go for a Total Internal Reflective (TIR) lens because it is the most accurate and complete.

The best LED lens for directing light right onto the plants is one with a 90-degree angle, although some products are 120-degree angles. The typical output of an LED light is around 160 degrees. If you choose a lens that is too wide, it will cover a greater area but will be less efficient because less light energy will be hitting your plants, and instead, will just be wasted. Don’t buy an LED light without a lens.

High powered LEDs and low powered LEDs

Regular LEDs use 30-60 milliwatts (mW), but higher powered LEDs use around 500 mW, or even more. The first 1-Watt LED light came out in 1999, but many people don’t understand the difference between a 1-Watt LED and a 3-Watt LED. To put it simply, the 3-Watt LED can run at 1 Watt, but the 1-Watt LED cannot run at more than 1 Watt because that is its limit. In other words, these names refer to the highest possible potential power output from the light.

Differences in price and quality

To start with, it’s a given fact that almost every LED grow light that you will find in stores, even ones with American designs, will be produced in China. At a minimum, most or all of the different components will come from China. There is a difference in quality between the low, middle, and high prices LED lights, we’ll explain those differences to help you choose the best lights for your grow room setup and budget.

Low price
Because these are lower in quality and spectrum, they will hurt the growth and yield of your marijuana plants. Simply put, these LED lights are not recommended over HPS or MH system lights, making it not worth the money at all.

Middle price
These LED lights will be more reasonable in their quality. They will have a better shell, come with a built-in fan, and will come from higher quality brand names that should be familiar although they still will not have the full spectrum that their more expensive counterparts will. More likely is that they are models with either 6, 8, 11, or 12 bands. The primary function of these bands is that they will cover the entire PAR range, but not thoroughly; there will be some gaps missing throughout. This means that, although they are better than the lower quality version, they are not as close to the sun’s spectrum as you can get with LED lights.

High price
These are the types of LED lights that are going to get you the best results in terms of marijuana plant yield. They don’t need a fan to stay cool, they are built with the best materials, and they incorporate the entire spectrum, getting as close to the PAR (and, therefore, are the most sun-like) as possible. These models should cover a range from 420 to 750 nanometers. Sometimes they will appear dim or dead to people because of the far-red part of the spectrum, which is 710 to 850 nanometers and is hard to see with many people’s eyes.

The highest quality LED chip will be from companies such as Cree, Bridgelux, or Epistar. The lights have the highest thermal engineering, allowing them to operate without a fan and still stay cool. You can rest assured that plants growing under these lights will reach their maximum yield potential, helping you end the season with a fantastic product. Although the costs are higher for these LED lights, the results are equivocal, making it well worth the extra spending.

Reputable LED brands
Whatever type of LED light you buy, make sure you choose one from a reputable source. The problem with there being so many options these days is that plenty of those options are sub-par, meaning consumers need to do their research before buying. Ask in-depth questions about the light intensity and the spectrum, and check for the most highly recommended products around.

Common problems with LEDs and how to avoid them

If you’re looking for an everyday, “standard” type of grow light, then LEDs may not be for you. They require a certain amount of research and patience, and they achieve different results than other types of grow lights. In order to avoid some of the common problems that occur with new LED growers, let’s look at some important facts and common problems with LED lights.

They change the appearance of your plants
Many growers who are newly using LED lights begin to panic when they see that their marijuana plants apparently have nutrient deficiencies because of some strange discoloration taking place. Before you start testing the pH levels and loading your soil with extra nutrients, however, consider the fact that it might simply be from using LED lights – and it is not necessarily a bad thing.

It is most common to see such discoloration during your plants’ flowering stage, particularly when they are reaching the end of it. The leaves will start appearing discolored, but as long as the lights are far enough away, the leaves aren’t actually falling off of the plant, and the buds are still healthy as ever, there is nothing wrong with your plant at all.

Distances can vary
Because LED lights are not as standardized as other types of lights, it is crucial that you check the manufacturer’s instructions for how far away from your plants your new lights should be. This distance varies according to the bulb size as well as the type of lens, so don’t start using it until you feel confident that you fully understand what should be done with your specific LED lights.

Generally speaking, smaller LEDs that have 1W chips should be a minimum of one foot away. The majority of LED lights with chips that are 3W or larger, however, should be at least 1.5 feet away. Otherwise, you could give your plants light burn. Remember that you can always ask the manufacturer for recommendations yourself. If your plants are starting to appear burnt on just their top part, you should probably try moving your LEDs further away.

HPS lights get a higher yield
While this statement is probably true, that does not necessarily mean that you will get a better yield with HPS lighting. LED lights may achieve a lower yield than HPS lights, but it is well known that buds given light from LEDs will be stickier, stronger, and have a more intense aroma. Remember, more is not always better, especially when you are growing something that will be consumed or smoked later.

Thank your for your readed, please visit our website http://ledgrowlight.co.nz LED Grow Lights is future for indoor grow marijuana.