The Best Grow Lights for Indoor Weed [Review]
Indoor cannabis growing operations are becoming increasingly popular. One reason for this is widespread legalization. Another is the comparative ease of growing and tending to the cannabis plant with modern, state-of-the-art equipment.
Cannabis is useful even for aspiring gardeners looking for a single plant to raise. The species is versatile, resilient, and relatively resistant to damage and infestation. For the aspiring marijuana user, growing weed at home can potentially save you a fortune. You can cut out the middleman and cultivate the herb from seed to flower, and ultimately to joint.
However, if you’re looking to start growing marijuana plants indoors, you need to choose the right grow lights. Without adequate light, you won’t get a decent harvest. The best lighting usually equals the highest quality THC, so it’s essential to get the best ones you can afford. There are so many different types of grow lights available that finding the ideal ones for your needs is challenging.
In this article, we provide a handy list of some of the best lights for indoor weed currently available on the market. Some of them are cheap; others are a little pricier. Regardless, if you use them correctly, they’ll get the job done.
The Best Grow Lights for Indoor Marijuana: What Types Are There?
There are a variety of different light types, with various pros and cons depending on what you’re looking for. We offer a rundown of the most common options below. Stuck for time? Check out the pros and cons of each at a glance.
● Creates less heat compared to other lights.
● Incredibly energy efficient, which means a lower energy bill.
● You can purchase them from a variety of locations.
● No learning curve for beginners.
● High initial cost.
● They can require large boards of LEDs due to their relatively low power.
● Some manufacturers make dubious claims as to the strength of their lighting.
● They’re typically the choice of professionals.
● They are the most intense light option available, ensuring your plants get all the light they need.
● Lower initial cost than LED.
● You need multiple types of HID grow lights for different stages of growth.
● HID lights require additional investment in protective hoods and reflectors.
● You need to replace the bulbs regularly.
● They run extremely hot and consume a lot of power.
● Low electricity usage.
● Low heat output means you can place them close to plants.
● You can use them in a small grow space.
● Only useful for small grows.
● Reduced efficiency and low yields.
● Every bulb needs a socket.
LED Grow Lights – The Modern, Efficient Solution
Short for light-emitting diode, an LED is a simple form of light with an efficient energy signature. Due to how the light is generated within an LED, they use a meager amount of electricity for the same amount of light compared to other sources.
However, LEDs have a pricing problem. The inexpensive ones are the type you don’t want. The lights you need for cultivating cannabis are costly.
If you try and use the cheap, Christmas-style lights, your weed harvest is going to be smaller than the LED’s carbon footprint. If you want to invest in your bud correctly, prepare to spend a substantial amount of money.
One great benefit of LED grow lights is that they create comparatively little heat when compared to other types of light.
This ensures you don’t overheat your grow room. Marijuana plants like a warm environment. However, excessive heat damages them, and may also cause a fire in your grow room.
LED grow lights can also distribute a fuller spectrum of light due to how the light is created through electroluminescence. This can result in a better, higher quality yield from your bud.
This benefit is somewhat counteracted by the fact that the average LED light board is quite low powered. As a result, you either require multiple boards or a huge, single one. Also, you only get the best results with LEDs that offer a full spectrum of light.
HID Grow Lights – The Traditional, Energy Hungry Choice
HID grow lights, short for High-Intensity Discharge, are large light bulbs that emit a tremendous amount of heat and light. They usually require a full exhaust fan to remove the excess heat, and electricity consumption is enormous. Also, they generally need a decent amount of time and space to set up a properly working system.
HID Lights are typically divided into a few different varieties or sub-categories:
Metal Halide Grow Lights
Metal Halide or MH grow lights are primarily used during the vegetative stage. This is the part of the cannabis plant’s life where growth takes off, and leaves begin to flourish. MH lights produce a strongly blue-tinged light, which the plants prefer at this stage of growth.
It might sound strange that a plant prefers a type of light. However, different colored lights are mostly just different wavelengths and intensities. Due to this difference in wavelength, the plant prefers stronger or weaker lights at various stages of its development.
For the early vegetative stage, the blue glow from the metal halide lights is best.
High-Pressure Sodium Grow Lights
High-Pressure Sodium, or HPS, grow lights are far more efficient than other forms of HID. They emit a gentler, yellow light that cannabis prefers when it is in the flowering stage. This yellow light helps encourage intense bud production. It allows you to configure the eventual size of your harvest more precisely.
You can buy HPS lighting in a variety of strengths, but don’t use 1000w. It is far too powerful, and is only suitable if you have created a vast underground field of weed! A pair of 400w or 600w HPS lights should suffice.
Light Emitting Ceramic Grow Lights
Also known as ceramic metal halide lights, this type of lighting features a collection of ceramic heating elements inside the lamp. Manufacturers use ceramic because it has a higher arc tube temperature. Arc tubes help create the lighting within MH lights. The result is enhanced efficiency and color rendering.
The choice of whether to use LEC over the standard MH grow light is a personal preference. However, it’s also tied to cost. LEC grow lights represent a higher initial investment. Yet they also are more efficient over the long haul, lowering your overall electricity bill.
HID grow lights are old school, and can produce a vast harvest but use a considerable amount of electricity. However, they’re still widely considered the standard for indoor marijuana cultivation due to their output of efficiency and power. They are also cheaper to buy before electricity costs enter the equation.
Fluorescent Grow Lights – Best Used for Small Grows
The two types of fluorescent lights are T5 and CFLs. The former is long and narrow, while the latter are twisted into the shape. They have cool, warm, or full-spectrum colors. Growers sometimes use them because they are cheap to buy, and have a low energy consumption which saves money on energy bills. They also provide a pleasant color for an indoor growing site.
Fluorescent lights also don’t require a ridiculous variety of different lights like HID lights.
Furthermore, fluorescent lights don’t need the investment of an additional setup like with HID. You also don’t need to include a particular ventilation system to keep the room’s temperature down.
However, fluorescent lighting provides lower yields than its rivals. You must also position them close to your plants to derive any benefit. This means you can use them in a small room, but they are ineffective if you plan to grow several plants.
Final Thoughts on the Best Grow Lights for Indoor Marijuana
When growing marijuana indoors, you have to decide what takes top priority. Do you care about your energy bills, the environment, secrecy, or efficiency?
If you’re looking for discretion, LED grow lights and fluorescent grow lights are the likeliest options. If it is efficiency you’re after, HID is probably the best grow light for marijuana available. That is, as long as you don’t mind the increase in your electricity bill.
Then again, if you have a grow space of less than five square feet, fluorescent light is enough when your plants are small. You can upgrade to a 250w HPS as the plants get larger. If you have space, an MH light for plants in the vegetative stage, and HPS for the blooming phase works well. Using MH lighting throughout is fine, but will have fewer flowers, more foliage, and a lower yield.
Different options work best for different solutions, so pick the one that’s right for you and work to its advantages. Once you have selected the right light for your needs, you can start growing cannabis. After you have chosen the soil type, your fertilizer preferences, and a few other things, of course!
Choosing the best grow lights for indoor marijuana cultivation setup is no small decision – it will determine the quality and the potency of your buds.
Grow Light Breakdown: Heat, Cost & Yields
For the many growers who are unable to cultivate cannabis outside in the free abundant sunshine, grow lights are necessary to successfully grow cannabis indoors. Grow lights take the place of the sun, and power the growth of your plants and their buds. Light is like “food” for your plants, so without a lot of bright light, even a healthy cannabis plant won’t produce much bud at all.
More Light = Bigger Yields!
(up to a point, it is possible to give your plant too much light!)
3 Main Classes of Marijuana Grow Lights
There are lots of options for grow lights that work well for growing cannabis indoors but in the end they boil down to 3 major types:
- (LEDs come in a huge variety of sizes and form factors. There aren’t really any “standard” types yet, though some lamps get better results than others.)
Note: Some growers may have heard of “Induction” grow lights, which are pretty rare these days but still pop up from time to time. There are two types: “Magnetic Induction” grow lights do okay for growing cannabis but they’re pretty much glorified fluorescent lights. “Plasma Induction” grow lights actually perform pretty poorly at growing cannabis.
Some types of induction lights are well suited to stadium lighting but honestly they just aren’t that great for growing cannabis and they come with huge price tags. Even a lot of LEDs are cheaper and you’ll get better results with them. You can learn more about induction grow lights here.
Note 2: Incandescent light bulbs (old fashioned light bulbs) are NOT suitable for growing marijuana!
Compare the Pros and Cons of Each Grow Light
1.) Fluorescent Grow Lights
Fluorescent grow lights come in many different shapes and sizes, from twisty bulbs to long tubes. Fluorescents are popular because they make efficient and pleasant lighting for humans, and also work great for herb gardens and other types of low-key indoor gardening without using a lot of electricity.
CFL Grow Lights
CFL grow lights are the twisty-looking bulbs you can find anywhere you normally buy light bulbs. They produce a great spectrum for growing cannabis and can be used in tiny spaces where no other grow light would fit such as the inside of a cabinet.
Keeping CFLs close results in the best yields and growth
T5 Grow Lights
T5 grow lights are one of the most easily available types of grow lights and are used to grow many different types of plants. As a result, they’re available in many garden and home improvement stores.
T5s are much bigger/wider than CFLs and usually come as part of a panel, but they can still be kept mere inches away from your plants without worrying about burning them.
These cannabis plants are thriving under T5 grow lights
Pros of Fluorescents
- Cheap to buy
- They don’t use a lot of electricity or make a lot of heat unless you have a lot of them packed together in a small space
- Great light spectrum for growing cannabis
- Since lights can safely be kept just a few inches away from plants, they’re a good choice for short spaces
- One of the best lights for clones, seedlings and young plants. Big lights must be kept far away from young plants to avoid burning them, which ends up wasting a lot of light and energy. By using smaller lights like fluorescents while plants are still short, you can save quite a bit of money on electricity during those first few weeks compared to using a high-powered grow light.
Cannabis plants under a T5 grow light – when plants are trained (like these ones in a Scrog setup) you can get pretty decent yields from fluorescents.
Cons of Fluorescents
- Fluorescent grow lights get smaller yields per watt than the other types of grow lights if you use them in the flowering stage while buds are forming. With fluorescents you can expect about 0.25 grams of buds for every watt of electricity (using the true watts out the wall, not any type of “equivalent” watts), while LEDs and HPS get 2-4 times as much yield per watt of electricity.
- The light from a fluorescent lamp doesn’t penetrate far down into the plant so they are best suited to plants that have been trained to grow short and flat; they aren’t powerful enough to support tall plants in the flowering stage.
Fluorescents are a great choice for clones, young plants, supplemental lighting and can save you money on electricity in the vegetative stage compared to using high power lights when plants are too young to use it all anyway. They can also be used to flower plants in spaces that are shorter than what’s possible with other grow lights (aka ‘stealth growing’).
That being said, when it comes to the flowering/budding stage, if you can fit a bigger light you will get significantly better yields/watt by using an HID or LED grow light!
2.) High Intensity Discharge (HID) Grow Lights
HID grow lights are much more efficient than fluorescent lights and are powered by large, oddly-shaped bulbs. They are usually screwed into a reflector or hood to reflect more light down onto the plants. HIDs are great at growing cannabis, but they also get very hot and are usually hooked up to an exhaust to help vent out heat.
Full tutorial on MH & HPS grow lights
(most common grow light combination for cannabis)
Full tutorial on CMH / LEC grow lights
(LEC stands for “Light Emitting Ceramic” and is a type of Metal Halide bulb that is built with ceramic like an HPS – basically it’s sort of like a blend between MH and HPS bulbs)
Metal Halide (MH) Grow Lights
Metal Halide grow lights are generally used for the vegetative stage because they produce a bluish light that vegetative plants love, though this type of light can also be used all the way to harvest.
The light from a Metal Halide appears a little bluish, and is well suited to growing cannabis plants in the vegetative stage
High Pressure Sodium (HPS) Grow Lights
High Pressure Sodium grow lights are often used during the flowering stage because they are very efficient and their yellow light stimulates bud production. HPS grow lights in the flowering stage get better yields per watt of electricity than any other type of grow light available today, which is a big part of why they are so popular.
The light from an HPS appears yellow, and is great for flowering plants because the light spectrum stimulates bud production
Ceramic Metal Halide (CMH) & Light Emitting Ceramic (LEC) Grow Lights
These are actually just two names for the same thing. This type of metal halide bulb uses ceramic as part of the lamp just like an HPS. As a result, CMH bulbs are more efficient than regular MH lights (though still not as efficient as HPS bulbs).
“LEC” and “CMH” both refer to Ceramic Metal Halide grow lights, which is a type of HID light that is a bit more efficient than a regular Metal Halide light
Pros and Cons of HID Grow Lights
- HIDs are the most efficient type of grow light (gets the highest yields/watt).
- Of all the HIDs, HPS grow lights are the most efficient and the best for the flowering stage. When using HPS grow lights in the flowering stage, you can expect about 0.5-1 gram/watt if all goes well.
- HID lights are simple to use because they can be hung the right distance from the plants with no guesswork on your part (unlike LEDs), and no need to adjust the lights all the time (like fluorescents).
- HID bulbs get really hot and generate a lot of heat. Because of the concentrated heat production, you will almost always want to put the bulb in a hood and also provide some sort of cooling to prevent heat from beaming down onto your plants and driving up the ambient temperature of your tent/grow room. This is especially important for the bigger lights with power above 250W.
- Additional setup – As a result of the heat mentioned above, most growers use an exhaust fan with ducting to vent out heat. Unfortunately, the prospect of having to deal with the fan and ducting scares off many growers from HID lighting.
- More parts – HID lighting means a few more parts than other types of lighting. Fluorescents are just the bulb and a fixture and most LEDs are just the light itself. But most HID setups have at least a bulb, fixture, an external ballast and an extra cable if you don’t count the exhaust systems parts, too.
Example of MH/HPS Setups That Yield 1-5 Ounces/Month
- 1-2 oz per month
- Electricity: $69/month (including electricity for fans)
- Initial Setup Cost: $605.00
- 1.5 – 3.5 oz per month
- Electricity: $96/month (including electricity for fans)
- Initial Setup Cost: $744.00
- 2.5 – 5 oz per month
- Electricity: $128/month (including electricity for fans)
- Initial Setup Cost: $780.00
There is a larger size MH/HPS grow light available (1000W), but at that size it starts going outside the scope of a “hobbyist” grower as far as ease and yields. In addition to needing a lot of extra cooling which costs electricity, a 1000W HPS grow light is less efficient compared to a 600W grow light (as far as how much light is put out for electricity used). I think most hobbyist growers would be happier with a 600W, or even two 600W lights, over a 1000W 🙂
HIDs are very well suited to growing cannabis and very easy to use once they’re set up. If your main goal is to get the highest yields possible, then HIDs are the way to go! However, they do require extra setup compared to the other grow lights because chances are you will need a fan to vent out heat from your grow space.
3.) LED Grow Lights
LED grow lights are very popular among cannabis growers as an alternative to HPS grow lights. They tend to run cooler and also usually come with built-in cooling. They can often be plugged into a wall and simply hung over plants which is definitely easier than setting up an HID grow light. LEDs also have great penetration so they don’t need to be moved frequently like fluorescents.
Simply hang an LED light over your plants and start growing!
- LEDs almost always have built-in cooling that pushes heat up and away from the plants (unlike HID bulbs which beam heat down on your plants and need to be cooled separately). As a result LEDs run very cool and many growers are able to get away without venting heat at all.
- The smaller size LEDs can be plugged directly into the wall and hung up over your plant, without needing to do anything else. You can just plug them in and start growing!
- Some growers believe LEDs produce more resinous bud. Combining LEDs with HPS grow lights seems to be getting some growers really great results, though more testing is needed.
- Although the LED lamp itself usually does run a lot cooler than a similar wattage HPS bulb, they still produce heat and the bigger sizes like 300W+ may need to be vented with an exhaust fan to prevent the grow space from getting too warm.
- Despite what some sellers may tell you, LEDs get slightly smaller yields per watt than HPS grow lights on average (LEDs commonly yield about 0.5g/watt, though some growers and lamps get better results than others!). There is a learning curve when it comes to getting the best yields from your LEDs, partly because each lamp is different and there are no “standards” to go by yet. A little experience with a specific lamp can improve your yields by a lot!
- LED grow lights tend to need a lot of space between the lamp and your plants, which means you need a tall grow space to get the best results. This is actually the main thing holding me back from trying LEDs more. Smaller LED panels should be kept 18″ or more away during the second half of the flowering stage to avoid light burning your buds (buds can be burned from too much light even if the temperature is cool), and some of the bigger models need to be kept 30″ or more away from the buds. When in doubt, contact the manufacturer!
If you get very high-wattage LEDs, you may need to vent out heat to keep the grow space cool
For growers who are looking to harvest 1/2 to 1 ounce of cannabis a month, LEDs may be your best choice. At this size, they are super low on electricity, run cool and need almost no setup! They get better yields than fluorescents but don’t run as hot as an HPS of similar wattage.
Note: When shopping for LEDs, make sure they contain some amount of green or white (full spectrum) light. Plants grown without at least a tiny amount of green or white light are very prone to nutrient deficiencies and simply don’t grow as well. Learn more about how light spectrums affect cannabis growth!
Now that you are familiar with all the most common cannabis grow lights I hope your choice is a little easier. I wish I’d had this information when I first started growing indoors 🙂 Happy growing.
There many grow lights that work well for growing cannabis indoors, but they boil down to 3 popular types: fluorescents (CFLs, T5s), HIDs (MH, HPS, LEC) and LEDs. Learn the differences so you can pick the best option for your setup!