In this article we will discuss:
- The advantages and disadvantages of using LED lights
- LED lights compared to other lights
- How do LED lights work?
- The LED lens
- High powered LEDs (HPLEDs) and low powered LED
- Making high-intensity white LEDs (WLEDs)
- Differences in price and quality
- Common problems with LEDs and how to avoid them
- Best LED lights compared
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.
Download my free marijuana grow guide at this link and learn to grow like a pro
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).
Download my free marijuana grow guide at this link and learn to grow like a pro
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 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.
3 band, 5 band, 11 band, and full spectrum LEDs
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.
Download my free marijuana grow guide at this link and learn to grow like a pro
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 lights
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.
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