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!
Types of Bulbs for Indoor Cannabis Grows
Types of Bulbs for Indoor Cannabis Grows; today we’re going to talk about the different classes and types of bulbs that you can get on the market, what each one is for and how efficient they are (we tried them all on our own plants). If you’re not sure what bulb to use or if you want to know why certain bulbs are twice the price of others, take a look at this article and you’ll understand.
Within the world of grow lights you can find energy-efficient bulbs and discharge lamps. Which is which? Well, they differ in various things, mainly that discharge lamps need a ballast and energy-efficient bulbs can be connected straight into the wall.
And of course, within those two types you can find growth bulbs, flowering bulbs and mixed bulbs. Growth lights give a light spectrum that’s kind of blueish-white, simulating the strong and persistent sunlight of spring which stimulates growth.
Flowering bulbs have yellow-red colors, which simulate the fall time which is when outdoor plants begin flowering, which therefore stimulates flowering in your plants.
Discharge lamps also have mixed lights, which can be used for both growth and flowering stages. These kinds of lights are the most common ones found in indoor beginner crops.
After all of that you’ll also need to pick the wattage that you’ll need; this is chosen depending on the space you have available for your crop and the amount of yield that you’re looking for. We’re going to make a list of all kinds of bulbs, model by model, so you can know what you’re buying and what type you need for your grow.
These bulbs are the ones that look like normal house lights except they’re much bigger. They’re perfect for using in small spaces as they hardly heat up and it’s easy to keep your grow’s parameters in check.
They don’t use a lot of power and they’re quite easy to install, all you need is a reflector with a light socket and a plug straight to the wall. Bring it as close as you can to your plants, making sure that it covers the entire grow area. Growth lights are perfect for putting on top of greenhouses or propagators when you’re rooting clones or for maintaining mother plants, as well as germinating and of course normal plants in the growth phase. You can also use it to help HPS lamps out when it’s too hot in the summer; you can switch out three of the six HPS lamps with energy-efficient bulbs and therefore lower the temperature in your grow considerably.
These bulbs are different when used for flowering however, they have a slight yellow color to them, although personally I don’t think they’re powerful enough for a healthy flowering period but you can use them like we said before, as a supplement for a hotter lamp. Some people don’t have any other options as their grows tend to heat up too much, so they use these bulbs and have to wait a couple more weeks as well as getting a lower yield.
They’re available in various wattages for all sorts of spaces. 105W bulbs are good for small greenhouses, around 60x60cm. 125W bulbs should be used for 80x80cm. 200W can be used for 1x1m spaces and 250W can be used for 1.2×1.2m grow tents.
These bulbs are full of heavy metal gases, like High Pressure Sodium (HPS) or Metal-Halide (MH) which are the most common discharge bulbs. Within each kind there are different wattages and brands. Like we said before, the wattage depends on the space that you want to light.
We recommend 250w for 80x80cm, 400w for 1x1m, and 600w for 1.2×1.2 at about 3m off the ground; these bulbs are extremely powerful.
Within these different wattages you can find different brands which, even if you don’t believe it, really do have a lot of differences. Here’s a list of them and my personal point of view on how useful each one is:
This is the most used bulb here in Spain thanks to its price; it’s one of the cheapest ones on the market right now. You can get a decent yield with these bulbs, and they give off a decent luminosity, although after a couple of harvests the intensity of the bulb tends to decrease quite rapidly. You can’t see it with the naked eye, but if you have a light meter you’ll be able to tell. Almost everyone’s first bulb was the Argolite Gro & Flo. It’s a good idea if you have no other choice, but for just a little extra money you can get much better lights. Available in 100W, 250W, 400W, 600W and 1000W.
This bulb is higher quality than the Argolite one. It has a more yellowish color and if you use your light meter to check, you can easily tell that the light is more intense straight away and it will last for much longer. Hardly any intensity is lost in between harvests, and you can get up to four harvests with this bulb before it loses too much intensity, although it will keep working for much longer. Plants flower really nicely under this light. Available in 400w and 600w.
Philips is probably the master of lights at this stage, and they have the perfect mixed bulb for your grows. This bulb can be used in both growth and flowering, rewarding your plants with a compact growth and exuberant flowering period. I think that the secret to these bulbs is the intensity of the light because when you go to check on your grow the light will practically blind you as soon as you enter the room. This bulb is the perfect choice if you want to get the most out of your plants without having to change the bulb as it works perfectly in growth and flowering, and that way you don’t have to mess about and try get the light out of the cooltube, which can be annoying.
Metal-halide bulbs that have a powerful white light which will make your plants grow as compact as they possibly can. If you use this bulb your plants will have short, strong branches that will be more than ready for flowering. When you’re growing in small spaces, the ideal thing is to use these kinds of lights as they will make your plants stretch a lot less than mixed lights. They also let off a lot of heat, so don’t let your plants get too close to the bulb and keep an eye on the temperature with a thermos hygrometer; place it at the top of the closest plant to the bulb and make sure the temperature is not over 25ºC. If it is you can move the bulb further away, they will still grow nice and strong. If you need to move it over a meter away from your plants you might have ventilation issues in your grow. Available in 250w, 400w and 600w.
This nice blue-white light will have your plants basking in the spring sun; the plants will grow nice and compact as this kind of light won’t induce them to flower or to even contemplate it. This light is another MH bulb and it can only be used in the growth period; it’s perfect for mother plants from which you want to get various clones every now and then as this light will help it sprout many new branches and they won’t stretch out too far. With this bulb, the most intense and penetrating light can reach even the lowest leaves. Available in 250w, 400w and 1000w. Strangely, there’s no 600w model available.
So there you have it, here’s a list of the best bulbs that you can get on our webpage. Use this list to check out which ones you think are good for your indoor grow. Sometimes those extra 10 quid are nothing compared to the results you can get over three or four harvests. Happy growing!
Author: Javier Chinesta
Translation: Ciara Murphy
All types of bulbs for indoor cannabis grows explained in detail so you can make a smart choice on what bulb you're going to use in your indoor grow.