CHM Grow Lights

What are Ceramic Metal Halide Lights?

Have you heard about Ceramic Metal Halide grow lights? There are a few types of grow lights that can help you to cultivate your indoor plants. Each one of them is similar to the natural sun system, and they can improve vegging and flowering.

The purpose of all grow light systems is to imitate the sunlight, and that’s why you should choose the best growing kit which contains bulbs with a color rendering index that is the closest to daylight effect. The best-rated on the market among all light kits are CMH grow lights. They represent the best choice for plants because of their price and efficiency. They are cheaper than LED kits and more efficient than HPS ones.

Before we check the list of the best Light Emitting Ceramic lights and light kits, let’s find out what CMH Grow Lights are, and how they actually work. In the sections below of this guide, you will also find out more about the advantages and disadvantages of ceramic metal halide lamps.

What is Ceramic Metal Halide (CMH) Growing Light?

Ceramic Metal Halide is a type of Metal Halide growing light that helps your indoor plant go through the whole growing process. However, the difference between CMH and MH systems is very important.

The MH growing light system is made of a quartz tube, so the result is a lower temperature this tube produces.

The CMH system is made of a ceramic tube that is very similar to the HPS system. It provides a higher temperature.

The next and very important step is that ceramic arc tubes have better mix gases than quartz glass tubes, and, as a result, they allow the best optimal spectrum.

The most important of many fundamental differences is that light produced by a ceramic metal halide bulb is the most similar to natural sunlight.

At the end of the day, CMH Grow Light systems are the best combination of HPS bulbs and MH bulbs in one single CMH bulb.

Related: Grow Light Guide


MIXJOY 315 Ceramic Metal Halide
  • High-quality ballast
  • Manufacturer warranty
Vivosun 315w Ceramic Metal Halide CMH/CDM
  • High-reflective VEGA Aluminum Hood
  • Solid suspension system
GC Grower's Choice Horticulture
  • Complete grow light fixture
  • Advanced square wave technology

Advantages and Disadvantages of Ceramic Metal Halide Grow Lights

Pros of Using CMH Grow Lights

Balanced Spectrum

The ceramic metal halide lights make the perfect balanced spectrum of lights that are desirable for all plants’ growth stages. It is the right combination of the blue metal halide bulbs and the red HPS bulbs.

Ceramic metal halide bulbs are similar to natural light that provide the right light source for your plant growth, and they don’t damage your eyes either.

Plus, this CMH light spectrum of two significant lights allows you to notice if there are some issues, discolorations, or damages during your plant growth.

CMH Lights Produce Less Heat

Using the CMH grow lights systems can reduce your necessity for some other cooling additional kits that can make you more costs.

These grow light kits cool more than other HPS or MP grow light kits.

What is very important to mention is that the light systems you’ve already had still need an extra cooler for your plants.

No matter what kind of indoor growers you are using at the moment, it is very important to make the best possible conditions for your grow room or tent.

CMH Lights are Efficient

The CMH system can easily replace the PAR light that is usually used to get optimal or higher temperatures.

That way, the CMH system is more economical when you compare it with the LED system.

CMH Lights Help Throughout the Growth Cycle

Speaking about the whole growth cycle, the CMH bulbs are the best choice for your plants because they are good both at the flowering stage and vegging stage.

One of the most bought is the Philips bulb with a warm color spectrum, like the Philips bulb with around 3100k.

CMH Lights Last a Long Time

One of the advantages, when you are using CMH bulbs, is that they can last more than 20,000 hours.

The MH bulbs and the HPS bulb have to be replaced after 10,000 hours of their use.

HID lamps spend their power quicker than any other CMH lamp that can save more than 80% of their initial lumen output.

CMH Lights Produce UV Light

It is useful to know that UV-C light can easily damage your plants.

That’s why CMH lamps have been specially designed with glass filters that immediately can block the harmful effects.

It is also well-known that the CMH lamps have all kinds of UV light that improve the yield quality. That means that you don’t have to use an additional light kit that can demand more money than is really necessary.

Cons of Using CMH Grow Lights

Ballast Compatibility

The standard CMH grow light kit cannot be used together with other electronic ballasts.

The standard electronic ballasts usually have high frequencies, and that is why they aren’t often compatible with ceramic metal halide lamps.

It is true that are many good ballasts that you can try to use for your light kit, but if you want to avoid some extra charges you should use the ones that are designed for CMH grow light systems.

The most honest advice for indoor growers is to buy the whole grow light kit of the same brand and start your grow light process in the safest way.

Initial Cost

A startup always comes with a higher initial cost.

Compared to traditional metal halide and high-pressure sodium systems, one basic ceramic metal halide system sometimes can have three times higher prices.

There are a few reasons why CMH grow light kit is worth buying it.

First of all, a CMH bulb doesn’t suck too much power, but it still provides enough grow lights. Opposite to a light-emitting diode, you won’t have to replace it so often.

Considering that CMH bulbs don’t use too much power, it is logical that they don’t heat too much either. Less heat in your grow room means that you don’t need a too expensive cooling system.

Investing a bigger amount of money in an excellent CMH grow light system could refund you that same money in a very short time, even sooner than you think.

Fundamental Differences between CMH Grow Lights and LED, MH, and HPS Lights?

You should be aware of the fact that the Ceramic Metal Halide grow system is a combination of a Light Emitting Diode system and a High-Intensity Discharge system.

As such, it has its own advantages and disadvantages.

In the sections below, you can read about the main differences between CMH grow light system, and other grow lights systems that are the most used for indoor plant growing stages.

HPS Grow Lights Vs. CMH Grow Lights

What’s the difference between HPS and CMH?

The high-pressure sodium grow lights system is made of the type of bulbs which don’t have too many blue lights needed for plant growth.

It has red and orange lamps that are great for flowering.

On the other hand, they are not good for vegging.

However, the CMH grow light is more perfect for vegging and flowering at the same time.

The CMH grow light is more expensive, it provides less heat, and it also uses less power at the same time.

Is CMH better than HPS?

The fact is that CMH grow lights produce a more balanced spectrum, but the fact is also that CMH bulbs are not as good as HPS bulbs in flowering.

HPS grow lights system is cheaper, but it doesn’t contain the blue color light that is very important for good grow light kits.

Metal Halide Grow Lights Vs. CMH Grow Lights

Speaking about the difference between the metal halide grow lights system and the CMH grow light system, the difference is very small.

The only significant difference is the price that is a little bit lower if you decide to buy a metal halide grow lights system.

The MH lights are maybe better at vegging part of growth, but not too much.

Although both systems are made of metal halide, it is not possible to use the same ballast for MH grow lights and CMH grow lights.

What is the Difference Between Metal Halide and Ceramic Metal Halide?

As we have already mentioned before in the previous section, the difference is really minimalistic.

If you have any doubts about what kind of these two systems you should choose, your worries are completely unnecessary because both systems are great.

The friendliest advice is to choose the one which parts of the kit you’ve already bought before. The main thing is not to combine the parts from the different light kits.

Is CMH better than MH?

The rate between CMH and MH isn’t so big, so, whatever you choose, we assure you that you will be very satisfied.

Light Emitting Diodes Grow Lights Vs. CMH Grow Lights?

What is the difference between LED Grow Lights and ceramic metal halide?

Now it is time to talk about the right difference between grow lights.

It is a fact that CMH provides more light than LED lights. It also provides as much heat at the same time.

A CMH grow light uses more power than an LED light, and as such, it hasn’t got a long-lasting lifespan.

However, its price is low.

On the other side, an LED light uses less power, and its lifespan is longer.

LED lights system has a perfectly designed spectrum that helps your plants grow faster.

The LED light spectrum was made in a way that you can control it and adjust it to your current needs.

Although the LED light grow system is more expensive, it can be a good investment that can eventually save your money later.

Which is better CMH or LED?

Without any further hesitations, we can confirm that LED lights are better than CMH lights. LED lights are better in yields and plants grow much healthier, there are no doubts.


We hope that this guide can help you to make the final choice between the best grow light systems, and that helped you to find out more about indoor grow plants’ tricks.

However, if you want to learn more about this subject, swipe down, and read the additional information section below.

Additional Information

Are CMH lights good for flowering?

The CMH grow lights are good for flowering, but they are better for vegging though. Their light spectrum makes the perfect full-cycle bulbs.

However, their price is a little bit higher, but they last longer than other standard lower wattage lights.

Is CMH better for veg or flower?

The CMH grow lights are good for both veg and flower, but they are slightly better at vegging. Because of their color rendering index, they improve vegging more than any other grow bulb system.

Their high blue spectrum allows plants to be more complex, but it also can limit their flowerings.

Are CMH grow lights good?

The CMH lights are very good because the broad spectrum that is emitted through a ceramic arc tube has many good influences on the plant itself.

Warmer lights are best to use, like Philips lights that are usually recommended.

How hot do CMH lights get?

The ceramic metal halide grow light can get the temperature up to 86 degrees.

Because of its infrared spectrum, it can get very hot.

However, compared to other grow light systems, the CMH grow lights have lower wattage than HPS, and it provides more heat than one light-emitting diode.

How much heat do CMH lights produce?

The CMH grow lights produce less than half of the heat that HPS grow lights do.

How much power does a 315 CMH use?

One 315 CMH bulb uses about 500W. Its lumen output is also lower because of its low wattage.

Do you need a ballast for CMH?

A ballast for CMH is absolutely necessary because the ballast is the key that starts and regulates your CMH light.

If you don’t see a ballast for CMH light, the CMH lamp won’t work at all, or it will burn too light as it actually needs.

How long does CMH ballast last?

A CMH ballast can last from 20,000 hours to 24,000 hours. It depends on the brand and its price.