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Are CMH lights any good?

Author

Mia Ramsey

Published Mar 09, 2026

Are CMH lights any good?

CMH bulbs are great for flowering, too, but not as good as HPS bulbs. They are much better at vegging though, making them the perfect full-cycle bulbs. CMH lamps are generally a bit more expensive than their HPS counterparts, but they make up for it with double the usable lifespan.

Regarding this, are CMH lights better than LED?

CMH fixtures put off more heat than LED's, but less heat than their HPS counterparts. However, the LED grower will use less power for cooling, but that savings depends on other factors in the grow space. The additional cost a CMH grower will realize is replacing bulbs.

Beside above, are CMH lights bad for your eyes? Unfortunately, that doesn't mean that this type of lighting is any better for your eyes. CMH emits large amounts of ultraviolet (UV) light. However, the effects of UV exposure on humans include cataracts, macular degeneration, pingueculae, pterygia—and skin cancer.

Likewise, people ask, are CMH lights good for flowering?

CMH grow lights are very good at flowering, especially those with a warmer color spectrum (around 3000K), like the Philips 3100K bulb we recommend. That said, high pressure sodium grow lights are better, since they contain even more red spectrum light.

Is CMH better for veg or flower?

A recent addition to the market is Ceramic Metal Halide (CMH) bulbs. This makes them ideal for growing from seed to flower with the one bulb. You will get more growth during the veg stage due to the higher efficiency and less stretching in the flower stage due to the high percentage of blue in the spectrum.

Do CMH lights get hot?

Heat Output

CMH grow lights usually output a lot of light in the infrared part of the spectrum (over 700 nm) which makes them output quite a lot of heat. Although it still less heat than other 400w HID bulbs, it's noticeable even if they're consuming a lower wattage.

What is the best CMH grow light?

Best 315w CMH Grow Light
  • Shop The NanoLux 315w CMH Grow Light Fixture.
  • Shop The Sun System Flower Power 315w LEC Fixture.
  • Shop The Growers Choice Master Pursuit 500 Watt CMH.
  • Shop The Gavita Pro 630e SE CMH Grow Light.
  • Shop The Growers Choice 630w CMH Grow Light w/ Bulbs.
  • Shop The NanoLux Summit Series Modular CMH Fixture.

What is the best LED grow light 2020?

The 10 Best LED Grow Lights For 2020
ModelHID- Equivalent WattageLife Span
California Lightworks SolarSystem 550w550W50,000 hrs
Marshydro Reflector 1000W1000W100,000 hrs
G8LED 900W MEGA LED Light900W100,000 hrs
VIPARSPECTRA Reflector-Series 450W450W100,000 hrs

What is the best light for vegetative growth?

Metal Halide (MH)

MH lighting is one of the most popular choices for vegetative growth among indoor gardeners. The high amount of blue light emitted by MH bulbs makes this particular type of lighting an attractive option.

Is CMH good for veg?

In general, MH and CMH lamps, because their more balanced spectrum and higher emittance of blue wavelengths, have been traditionally used in vegetative growth cycles. Plants that benefit most from metal halide lamps are vegetables like leafy greens and herbs, and cannabis during its vegetative and mother growth stages.

How many watts does a 315 CMH pull?

240 watts

Is LEC and CMH the same?

Ceramic Metal Halide (CMH) – Metal Halide light that uses a ceramic arc tube like an HPS. However, the term “LEC” is starting to become interchangeable with the term Ceramic Metal Halide (CMH) since they're both referring to the same technology.

Is CDM better than HPS?

The enhanced spectrum of light emitted from a CDM grow light will increase complex sugar production and essential oils within a plant in comparison to a standard HPS grow light, and in doing so will enhance the flavour of produce and increase the overall quality of yield.

Can you flower under CMH?

The CMH lights are very nice and work very well. The only issues I've seen are where someone believed the lies and undersized their lighting for their space. 3x3 is about the max size for a 315 CMH alone for flower. CMH is actually less efficient than HPS.

How far away should light be from plants?

12"

How far should CMH lights be from plants?

Both the 315 LEC and 315 CMH grow lights should be kept at least 18″ from the top of your plants, with some models needing to be kept as far as 3 feet away. “CMH” grow lights have been around for many years, and used to come in typical HID sizes like 400W, 600W and 1000W.

What is the best type of grow light?

Offering low energy usage, low heat, and color optimized for growth, LED lights are the most efficient, effective, and customer-friendly way to grow plants at home than growing with fluorescent lights or incandescent lights. An LED grow light array.

How many amps does a 315w CMH use?

1.375

Is CMH full spectrum?

Since CMH grow lights produce a full spectrum of light, it will produce some UltraViolet and InfraRed light. These parts of the spectrum are very helpful for warding off pathogens like mold and mildew, and even some pests. Plants grow more healthfully under CMH grow lights than LED grow lights.

Whats better HPS or LED grow lights?

In comparison to HPS lights, LED grow lights are incredibly energy efficient. High quality LED grow lights can produce equivalent yields to HPS grow lights using significantly less energy. Although LED grow lights tend to have higher upfront costs than HPS lights, they offer long-term savings.

What type of light is best for growing plants indoors?

Like plants growing outdoors in the sunlight, indoor plants grow best under full-spectrum bulbs, which produce a balance of cool and warm light that replicates the natural solar spectrum. They're excellent for seedlings as well as houseplants, culinary herbs and other plants.

Is grow light bad for eyes?

There is no question that any grow light can cause harm to your plants if used improperly. The LED lights are very concentrated and can damage your eyes. This is truer than ever with today's high power LEDs. Never look directly into LEDs and wear sunglasses.

Is grow light bad for humans?

At a high enough intensity, any type of light, regardless of the source has the potential to harm the eyes or skin through prolonged thermal exposure or photochemical effects of ultraviolet, blue light &/or infrared emissions. Higher concentration light sources will provide more direct energy and a higher risk.

Can plant grow lights cause cancer?

Over-exposure to UV light is widely known to cause skin cancer, premature aging, immune system suppression, and eye damage.

Are blue LED lights bad for your eyes?

A 2012 Spanish study found that LED radiation can cause irreversible damage to the retina. A 2019 report from the French Agency for Food, Environmental and Occupational Health and Safety (ANSES) warned of the “phototoxic effects” of blue light exposure, including an increased risk for age-related macular degeneration.

Is red light bad for your eyes?

According to research, red light therapy is safe for eyes, but precautionary measures must be taken. It should only be administered by a doctor and not self-administered at home. Unlike ultraviolet (UVA and UVB) light, red light will not burn your eyes, although you may feel a gentle warmth during treatment.

Can LED grow lights cause sunburn?

Intense lights can cause burns on the skin, and a “sunburn” on the retinas will interfere with your ability to see. The same is true of any bright light, LED or conventional. At the same time, very bright lights too close to the plants could “sunburn” them, too.

Are HID lights bad for your eyes?

While you're working under these lights, your eyes won't focus correctly. Not only does this mean our eyes take in way too much light, it can also cause headaches, dizziness, and both short and long-term problems with your vision.

How do I know if my CMH bulb is bad?

Signs that a Metal Halide light bulb or ballast needs replaced: The lamp appears to be a different color, or are turning pink.

Are HPS lights dangerous?

High pressure sodium lights have made indoor growth of crops possible, but without the proper safety precautions these lights can do serious damage to the human eye. The damage done is often times irreversible so it is imperative that people working in grow rooms take the proper steps to protect their eyes.

What is COB grow light?

A COB (short for Chip-on-Board), is an LED packaging technology that describes mounting multiple LED chips directly onto a substrate to form a single module. Multiple LEDs, minuscule in size, are wired and packaged together into a single ceramic or copper board so that they function as a sole light source.?

How long do CDM bulbs last?

But on average, you should use each lamp no more than: 4000 - 5000 hours (HPS) 3000-4000 hours (CDM) 2000 – 3000 hours (MH)

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