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Grow Light Breakdown: Heat, Cost & Yields

by Nebula Haze

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!)

Marijuana plants growing under the sun - in order to replace the sun indoors, growers need to get cannabis 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:

1.) Fluorescent Grow Lights

2.) High Intensity Discharge (HID) Grow Lights

3.) LED Grow Lights

  • (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.)

Incandescent light bulbs are not suitable for growing cannabis!

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 2Incandescent 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.

Read full tutorial on CFL grow lights

Read full tutorial on T5 grow lights

CFLs (compact fluorescent bulbs) can be successfully used to grow cannabisCFL 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

Keep CFL grow lights as close to your marijuana buds as possible in the flowering stage, but don't accidentally burn them!

Learn more about CFLs

T5 Fluorescent Grow Light System for growing cannabisT5 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

Example of a T5 grow light (fluorescent light fixture) - T5s can be kept very close to cannabis plants without worrying about burning them.

Learn more about 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.

These cannabis plants were grown under a T5 grow light

Read more about CFLs vs T5s

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.

Example of CFL grow setup which yields up to half ounce per month


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!

Learn more about T5 grow lights

Learn more about CFLs

You might be interested... More on CFLs vs T5s


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.

Metal Halide Grow Lights (MH) give off a wonderful light spectrum for marijuana's vegetative stage High Pressure Sodium Grow Lights (HPS) are the golden standard for growing marijuanaGet an LEC grow light for growing cannabis on

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)

Example of an HPS setup with an exhaust in a grow room. In order to keep HPS lights cool, it's usually necessary to use some sort of cooling system to vent out extra heat.


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

Example of vegetative cannabis plants growing under a Metal Halide (MH) grow light

Learn more about MH grow lights

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

Example of a room full of cannabis colas growing under an HPS grow light

Learn more about HPS Grow Lights


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).

Lately I've been seeing CMH grow lights these labeled as "LEC" lights, which stands for "Light Emitting Ceramics." Since LECs are the same thing as CMH lights, personally I think the term "LEC" is used to make this seem like some new type of light, and in order to ride on the popularity of LEDs....

"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

Get an LEC grow light for growing cannabis on

Learn more about CMH / LEC grow lights

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

250W HID

  • 1-2 oz per month
  • Electricity: $69/month (including electricity for fans)
  • Initial Setup Cost: $605.00

400W HID

  • 1.5 - 3.5 oz per month
  • Electricity: $96/month (including electricity for fans)
  • Initial Setup Cost: $744.00

600W HID

  • 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. 

Learn more about MH / HPS grow lights

Learn more about CMH / LEC grow lights


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!

Example of a cannabis plant "looking up" at an LED grow light

Learn more about growing cannabis with LED grow lights

You might be interested: 5 Barriers to Total LED Grow Light Domination!

Fat cannabis buds under BlackStar LED grow panels


  • 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.

Example of cannabis plants growing under an LED grow light


  •  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

Example of an LED grow light in a tent with an exhaust system to vent out heat

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.

Here's an example of an LED setup that yields up to 1 ounce/month

Check out the LED starter shopping list!

Note: When shopping for LEDs, make sure they contain some amount of green or white (full spectrum) light. If you see an LED lamp that only has diodes for red and blue light (which was very common in older models), don't get it! 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!

Learn more about growing cannabis with LED grow lights

You might be interested: 5 Barriers to Total LED Grow Light Domination!



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!!!

~Nebula Haze



Example of happy cannabis plants growing under the sun - grow lights are needed to replace the sun when growing marijuana indoors!Ready to learn more? How to increase....