Light is one of the most important factors in the success of a cannabis crop. Light is essential to the process of photosynthesis, in which a plant turns the energy from sunlight into chemical energy that it can use to grow strong and healthy; in the case of cannabis, this process also drives the development of buds.
If you can't grow your plants outside where the sun shines on them, you can use grow lights that replicate sunlight's spectrum to get the job done.
With the help of grow lights, you can regulate the quantity of light your plants receive, making sure they get the same amount of light each day regardless of weather or overcast days.
Some grow lights cost more up front, but they have a lower wattage requirement and last longer, saving you money in the end. Some grow lights are better suitable for young plants, while others are better suited for mature plants, and some are heavier or lighter than others.
It might be difficult to know where to start when shopping for lighting because there are so many options. Here is an overview of the four most common kinds of grow lights on the market and some information about their relative merits and shortcomings.
Last update on 2022-11-28 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API
The amount of money you have available is the primary factor before purchasing a grow lamp. As more jurisdictions legalize marijuana for recreational use, home cultivation is gaining ground, and so, too, is cutting-edge growing technology.
A huge, state-of-the-art LED can cost as much as $2,000, while you can get lights for around $100, albeit they may not be of high quality or generate the correct spectrum of light.
Think about how often you'll be harvesting weed, because the return on investment for an expensive light will be much slower if you just harvest once a year, as opposed to if you harvest several times a year.
All lights will increase your monthly electricity bill, but some more than others, so be sure to include that in when making your choice of light. While high-intensity discharge lights (HIDs) are more affordable initially, they can quickly rack up your electricity bill. On the other hand, light-emitting diodes (LEDs) are more cost-effective in the long run.
Some lights, like HIDs, can get rather warm, so you may need to invest in fans or an air conditioner to keep your grow room at a comfortable temperature. Your utility costs will increase in tandem with the addition of new machinery.
There are considerably hotter running bulbs available. For instance, HIDs generate a lot of heat and necessitate a cooling system. If the temperature in your grow room gets too high, it could stunt your plants' development. The 'cheaper' HID configuration will incur additional costs if you opt for this.
What are your plans for the size of your grow space? Keep away from 'hot' lights if your living quarters are on the cramped side, as they will quickly raise the ambient temperature. There isn't enough room for a central air conditioner, either.
Make sure your breaker board has adequate outlets and power to run your lighting without any problems. Next, you should examine all of your gadgets and calculate their total power use. There is a significantly higher chance of electrical fires if there is insufficient power capacity.
In order to bloom, regular (photoperiod) cannabis plants need exposure to a wide range of light frequencies. During the vegetative stage, blue-spectrum light is required, while the shift to red-spectrum light ushers in the flowering phase. However, the light spectrum is of less relevance if you begin with autoflowering plants because you will not need to make any adjustments to the lighting to initiate the flowering period.
A good rule of thumb is to invest in lighting that covers both the blue and red light spectrums for growing cannabis of any kind. For typical plants, this method eliminates the need to go to the trouble and expense of adjusting the illumination in order to trigger blooming. Because of the wide range of wavelengths present in LED lighting, the same bulbs can be used from planting through harvesting.
Power output is measured in watts. This figure is important since it determines how many bulbs can be used. In the event that your grow room is somewhat modest in size, you may just need a single, powerful light source. If the lights you use have a low wattage, though, you'll have to use more of them to get the job done.
The wattage of your lights is one factor in deciding how far apart your plants should be. In general, you should put your plants further away from the lights if they have a higher wattage, as the lights will burn them if they are too close. LED lights, however, are an exception to this rule due to their remarkably low heat output in comparison to other types of lighting using the same wattage.
The amount of light produced by an illumination source per second is measured in lumens. Photoperiodic plants have a greater need for lumens, just as they do for the full spectrum of light. During their development, "regular" cannabis plants have various lumen needs. For instance, during the vegetative stage, they require 2,500 to 5,000 lumens per square foot of light, while during the flowering stage, that number increases to 10,000 lumens per square foot.
So, when looking at different lights for weed cultivation, it's important to evaluate how many lumens each one has. For optimal growth, cannabis plants require lighting with a lumen intensity of at least a certain threshold.
The color and intensity of the emitted light is measured in kelvins, which indicate how hot the light is. In its vegetative state, cannabis does best in cool, blue light of around 6,400 kelvins. Contrarily, cannabis flowers thrive in red light at a temperature of around 2,700 kelvin.
Clearly, the finest lights for growing weed are not necessarily the most expensive ones. Considering how many plants you intend to cultivate, where you intend to grow them, and how much energy you have available is very important when cultivating photoperiod plants.
Can I Use Any LED Light as a Weed Grow Light?
Yes. However, the amount of energy an LED light needs to sustain a plant varies at different stages of its growth. You'll need a more powerful LED as your plants grow larger. The regular LED bulb that was sufficient during the vegetative stage is not enough during the flowering period.
Do I Need Special Cannabis Grow Lights?
Yes. In the open air, where the sun shines brightly, cannabis plants thrive naturally. Marijuana grow lights serve to mimic this light source as closely as possible. They not only make sure your plants get enough light, but also that they get the proper kinds of light.
Are House Lights Good for Plants?
No. The typical home's illumination is completely inadequate for growing marijuana. Its intended purpose is to aid human seeing, not plant photosynthesis.
How to Use LED Grow Lights for Growing Cannabis?
For the most part, a larger number of smaller LED panels will produce better results when used as grow lights than a smaller number of larger LED panels. As an illustration, rather than using a single 250W LED fixture, it is generally preferable to use two 125W fixtures for a total of 250W. This is because increasing the number of panels usually makes it simpler to direct the light where it is needed.
LED models with 3W chipsets (each individual bulb is 3W) seem to achieve some of the best yields/watt of all LED models while cultivating cannabis, without a great deal of concern about light-burning your plants.
The amount of electricity that an LED panel actually draws from the wall is referred to as its "actual power draw" or "actual power consumption." This is the closest thing to a direct comparison of different LED grow lights.
When using LED panels, the ideal intensity is 50–60 watts per square foot of grow space.
In-home cannabis cultivation requires prioritization. Do you value efficiency, low energy costs, privacy, or the well-being of the planet?
Grow lights that use fluorescent or light-emitting diode (LED) technology are your most likely bet if discretion is desired. In any case, if you're looking for productivity, HID is arguably the greatest grow light for marijuana. That is, if you don't mind a slight jump in your monthly electricity cost.
However, when plants are young and your grow space is less than five square feet, fluorescent light will suffice. Once your plants have reached a certain size, you can switch to a 250W HPS. If you're growing your own plants and have the room, MH lights are great for the vegetative stage and HPS for flowering. Full-cycle MH illumination is acceptable, but it will result in less fruit and greater foliage growth and a smaller harvest.
The optimal course of action depends on the problem at hand; therefore, it is important to carefully consider your options before settling on a course of action. Growing cannabis begins once the proper lighting has been chosen. After deciding on the soil type, the sort of fertilizer you want to use, and a few other factors.