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The Different Types of Lights for Cannabis: Pros and Cons

Learning about the many types of grow lights available can be overwhelming, especially for those new to cannabis cultivation. They all serve the same purpose, but many of them go about it in different ways. To clear up the confusion, we’ll be taking a look at the different types of lighting, and breaking down their pros and cons.

Let’s run through a detailed comparison of the most popular cannabis grow lights.

Contents:

Every cannabis cultivator knows how important proper lighting is when it comes to achieving a successful harvest. Along with nutrition and water, it’s one of the most crucial factors in ensuring healthy growth and bountiful yields.

Although natural sunlight is usually optimal for cannabis growing, many cultivators prefer to grow indoors for various reasons. First, not everyone lives in a climate where outdoor growing is feasible. Second, indoor growing involves timed artificial lighting, giving the grower more control over the vegetative and flowering phases of their cannabis.

With that in mind, we believe exploring the world of cannabis grow lights is more than worth it.

Pros and Cons of Different Cannabis Grow Lights

Today, you can find many different types of grow lights for indoor cultivation. But not all are equal; in fact, there are big differences when it comes to effectiveness and cost. In turn, some grow lights may be better suited for certain types of setups than others.

Let’s take a look at the types of grow lights available, and compare them relative to their pros and cons.

FLUORESCENT (CFL) GROW LIGHTS

CFLs, also known as “compact fluorescent lights”, are some of the most common you’ll see out there. You can get these lights at many places, including home improvement stores and even grocery stores.

FLUORESCENT (CFL) GROW LIGHTS

CFLs, also known as “compact fluorescent lights”, are some of the most common you’ll see out there. You can get these lights at many places, including home improvement stores and even grocery stores.

They are especially suited to small grows, and will be the most affordable starter lights you’ll find. Conveniently, these bulbs have standard sockets so you can use them with any standard light fixture. They do not require any special equipment.

You can find “daylight” CFL bulbs at 6500K or “warm white”, with a more reddish light spectrum, at 2700K. Bulbs with a daylight spectrum are more suitable for the vegetative growth phase, while warmer CFLs are better for the flowering phase.

CFL PROS CFL CONS
Low cost and widely available Low light output (only suitable for growing 1–2 plants)
Easy to set up and use Not optimal for flowering (produces subpar yields)
Good for beginners Tends to have a shorter lifespan than other lights
Available in various wattages and colour temperatures
Uses little electricity, saves energy
Doesn’t get hot
Perfect for clones and seedlings
CFL PROS CFL CONS
Low cost and widely available Low light output (only suitable for growing 1–2 plants)
Easy to set up and use Not optimal for flowering (produces subpar yields)
Good for beginners Tends to have a shorter lifespan than other lights
Available in various wattages and colour temperatures
Uses little electricity, saves energy
Doesn’t get hot
Perfect for clones and seedlings

CFL Cost and Expected Lifespan

A standard 40W CFL bulb will only cost a few bucks. This makes them great starter lights for growers on a budget! It’s a lot of bang for your buck, too, as the expected lifespan for compact fluorescents is about one year.

Yield per CFL

Expect to obtain 0.3 grams per watt (roughly 12 grams per standard light).

HID (MH and HPS) Grow Lights

HID (high-intensity discharge) grow lights are somewhat of a gold standard in the cannabis cultivation industry. Many growers swear by HID lighting and believe that they produce the best and biggest yields.

HID (MH and HPS) Grow Lights

HID (high-intensity discharge) grow lights are somewhat of a gold standard in the cannabis cultivation industry. Many growers swear by HID lighting and believe that they produce the best and biggest yields.

There are two main types of HID lights: MH (metal halide), and HPS (high pressure sodium) lights. The difference between the two is that MH lights produce a “cooler”, blueish light, whereas HPS lights are usually red. This makes MH lights more suitable for the vegetative phase, with HPS lights being better for flowering.

Therefore, most advanced growers use a combination of MH and HPS bulbs for the duration of the process. If, for some reason, you need to choose one type of HID for the entire grow, we would recommend HPS lights. 600W HPS lights are the most popular type. In most cases, you can usually get complete sets that include the bulbs, a ballast, and a reflector.

HID PROS HID CONS
Compared to high-end LEDs, HID grow lights cost less outright They give off intense heat that can spike grow room temps or burn plants
Easy to set up and operate, even for relative beginners You’ll need additional equipment to operate them, including an electronic ballast and reflector
Produces excellent yields HID bulbs degrade over time, and you will have to replace them periodically
Reliable and consistent HID lights are very power-hungry and can significantly increase electricity bills
Options for growth and flowering
HID PROS HID CONS
Compared to high-end LEDs, HID grow lights cost less outright They give off intense heat that can spike grow room temps or burn plants
Easy to set up and operate, even for relative beginners You’ll need additional equipment to operate them, including an electronic ballast and reflector
Produces excellent yields HID bulbs degrade over time, and you will have to replace them periodically
Reliable and consistent HID lights are very power-hungry and can significantly increase electricity bills
Options for growth and flowering

HID Light Costs and Expected Lifespan

As discussed, you can find complete HID lighting kits that include a lamp, a ballast, and a reflector for €150 and up. The low initial cost, however, will be offset by the higher operation cost (i.e. your electric bill).

The bulb lifespan is approximately one year. In turn, you should replace your bulbs annually to maintain optimal light output.

Yield per HID Light

You can expect around 0.5–1g+ per watt, which is roughly 300–600 grams/standard light.

LED GROW LIGHTS

Just a few years ago, LEDs were not suitable for “serious” grows, aside from providing light for seedlings or clones. However, LED technology has come a long way in a short time.

LED GROW LIGHTS

Just a few years ago, LEDs were not suitable for “serious” grows, aside from providing light for seedlings or clones. However, LED technology has come a long way in a short time.

Most quality LEDs emit a light that works for both veg and flowering, while some come with a switch to change the light spectrum according to the appropriate phase. Modern LED grow lights, such as those with COB (“chip on board”) technology or “Quantum boards”, can now provide solid light intensity and penetration, even for the most demanding grows. Today, LEDs can rival, or even surpass, other types of grow lighting, including HID lights. That being said, you need to get the right ones. These lights tend to be some of the most expensive, but they can also save you some serious money in the long-run.

LED PROS LED CONS
Most energy-efficient type of grow light (saves money and energy over time) High-quality fixtures with modern modules can put a decent dent in your wallet
LED lights run much cooler compared to HID lighting, barely producing any heat at all There is no industry standard for LED lights
Cuts back on cooling costs and reduces risk of burning plants Cheap models on the market produce inferior results
Most commercially available LED grow lights are “plug and grow”—no special ballast required Potentially lower yields than HID
Streamlined; can support both veg and flower
LED PROS LED CONS
Most energy-efficient type of grow light (saves money and energy over time) High-quality fixtures with modern modules can put a decent dent in your wallet
LED lights run much cooler compared to HID lighting, barely producing any heat at all There is no industry standard for LED lights
Cuts back on cooling costs and reduces risk of burning plants Cheap models on the market produce inferior results
Most commercially available LED grow lights are “plug and grow”—no special ballast required Potentially lower yields than HID
Streamlined; can support both veg and flower

LED Light Cost and Expected Lifespan

You may find a low-quality LED fixture for a single plant for €120. But for good LEDs from a reputable brand, expect to pay several hundred euro, even up to €2,000. You get what you pay for with LEDs, so it’s always worth doing your research and finding a reputable brand.

Good LED grow light fixtures have a lifespan of 5–10 years.

Yield per LED Light

0.5g–1.8g per watt, depending on the make/quality of the light.

LEC GROW LIGHTS

LEC lights, also called ceramic metal halide (CMH) or ceramic discharge metal halide (CDM) lights, are the last type we’ll be discussing today.

LEC GROW LIGHTS

LEC lights, also called ceramic metal halide (CMH) or ceramic discharge metal halide (CDM) lights, are the last type we’ll be discussing today.

The name also hints at the difference between LEC lights and conventional HID lights. LEC lights use a ceramic arc tube, rather than the quartz version found in regular MH lights. The result is a more natural colour, more lumens per watt, and a longer lifespan. LECs include built-in ballasts, so that aspect of setup is very simple.

While modern LED lighting is now becoming the de-facto standard in most grow rooms, LEC lights do have certain benefits. This makes them an interesting alternative to other types.

LEC PROS LEC CONS
Emits a natural light spectrum (easier to see your cannabis and spot issues) UV-B light is harmful to humans (safety equipment is needed to reduce risk to skin and eyes)
LEC lights give off UV-B rays that may improve yield or trichome production High setup cost
Simple setup and operation Generates lots of heat
Longer life-span than HID lights Slightly less powerful than HID lights
UV-B rays are blocked by glass
LEC PROS LEC CONS
Emits a natural light spectrum (easier to see your cannabis and spot issues) UV-B light is harmful to humans (safety equipment is needed to reduce risk to skin and eyes)
LEC lights give off UV-B rays that may improve yield or trichome production High setup cost
Simple setup and operation Generates lots of heat
Longer life-span than HID lights Slightly less powerful than HID lights
UV-B rays are blocked by glass

LEC Light Cost and Expected Lifespan

Decent LEC grow light fixtures start at €250–300, with higher-end models setting you back up to €1,000. The bulbs also cost somewhat more than normal MH/HPS bulbs.

On the plus side, LEC bulbs will last about twice as long as HID ones, approximately two years.

Yield per LEC Light

When utilising LEC lights, you can expect up to 1.5g per watt.

Which Lights Are Best for Growing Cannabis?

So, what type of grow lighting is best? This is a decision that will depend on various factors, including the size of your growing area, the type of weed you’re growing, and, last but not least, how much you can spend.

If you require a light for seedlings and clones, or you happen to have a “micro grow” in a very small space (like a cupboard), you are likely best off with a simple CFL light.

For slightly bigger grows, consider a decent LED light anywhere from 400–600W. As there won’t be much heat from the light, you may be okay with a simple exhaust system and a fan.

For medium to large growing operations, you can look into high-end LED fixtures and LEC lights, or go with proven HID lighting solutions.

Don’t Just Look at Wattage — Power Equivalents Between Types of Lights

Now, be aware that a 200W CFL isn’t the same as a 200W light LED, and neither are the same as a 200W HID. The wattage only indicates how much power the fixture uses, not saying anything about the light output. Because lighting technologies differ in their efficiency, you can’t compare them based on their wattage alone. The only type of light where one can expect certain yields (given a particular wattage) would be HID lights, as these are standardised.

Likewise, this also means that a LED fixture stated as being 600W doesn’t necessarily emit the same amount of light (and therefore produce the same yields) as, say, a 600W HID light. Honestly, the only way to determine true light output is to go over the specs from the manufacturer. Better yet, ask other growers for their experiences with a particular make or type of light—that way you’ll know what to expect.

Lights, Lights, Lights: Illuminating Your Options

Choosing the right grow light for your cannabis is among the most important decisions you’ll make.

If you want superb yields, you definitely can’t bypass getting at least a 600W or stronger HID light, or an equivalent LED or LEC. If, on the other hand, you’re looking after seedlings and clones, a less powerful CFL will do.

Most importantly, don’t spend money on a grow light without getting informed at first. A great “bargain” may ultimately just be a waste of your hard-earned cash. If prices for a good light are intimidating, you can also look into DIY solutions! You can find all sorts of kits online that come with the necessary parts. That way, you can save some money while getting a quality light that will serve you and your plants well.

In this article, we’ll be comparing grow lights made for indoor cannabis cultivation, looking at their pros and cons, and seeing what lighting solution is best.

Types of Bulbs for Indoor Cannabis Grows

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  • Escrito por : Ciara
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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.

Energy-efficient bulbs:

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.

Discharge Lamps:

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.