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What is the Strongest Laser You Can Legally Own? Understanding Legal Laser Limits

What is the Strongest Laser You Can Legally Own? Understanding Legal Laser Limits

What To Know

  • Laser devices are categorized into four classes based on power and hazard potential, with Class 1 being safe for public use and Class 4 being highly dangerous.
  • In many countries, owning laser products above Class 3R (over 5 mW) is prohibited, while in the US, owning any class of laser is legal as long as it’s FDA compliant.
  • The strongest laser beam recorded is around 2,000 trillion watts, used in fields like healthcare and clean energy generation, while the most powerful color for visibility is green, and blue/violet for burning capabilities.

In this article, I’ll clarify what the strongest laser you can legally own is and the legal laser limits that govern their ownership and usage.

Let’s dive into the legal landscape of laser device ownership.

Laser Devices’ Classification

There are several levels of lasers that are distributed into 4 different classes according to their power and how many hazards they could cause.

Class 1

The first class has two levels: Class 1 and Class 1M (M for magnification). The Class 1 lasers are safe for public use as they don’t emit any harmful radiation or damage the eye because they’re low-powered and have a tight enclosure. Class 1M includes some fiber-optic communication instruments.

Some lasers in the high-power ranges of Class 3 and 4 are considered Class 1 as they incorporate additional safety measures that make them less hazardous like CD/DVD players and laser printers.

Class 2

The Class 2 lasers have power levels of less than 1 mW. They are more powerful than Class 1 and emit visible laser light.

It’s not harmful to the naked eye when exposed to it for momentary periods as it induces a blink reaction from the person and forces them to immediately look away from the light.

Devices in the Class 2 level include some laser pointers used by lecturers or speakers in conferences, as well as barcode scanners. Some measurement instruments used by construction workers and civil engineers like level and orientation instruments are considered Class 2M.

Class 3

Class 3 includes two levels: 3R and 3B. The Class 3R lasers have power ranging between 1 and 5 mW. They have a low risk of damaging the eyes and aren’t hazardous.

They might cause flash blindness if viewed for brief moments. Some powerful laser pointers are Class 3.

The Class 3B power levels are between 5 and 500 mW. They have medium risk on the eyes and can cause varying damage depending on the duration and distance of the exposure. Physiotherapy treatment and research devices are equipped with Class 3B lasers.

Class 4

This class has the lasers with the highest power levels which are 500 mW or higher. They shouldn’t be used by the public as they can cause severe eye and skin injuries, in addition to fire hazards. They can even cut through materials like steel.

They’re usually used in medical operations like laser eye surgeries, industry, and military systems, and sometimes in the entertainment industry.

What Lasers Can You Legally Own?

Strong laser pointer lying on a table

The strongest laser you can own?

In lots of countries, laser products of classes higher than 3R and power greater than 5 mW are prohibited. Other countries allow lasers only up to Class 2. For example, Australia bans the use of any laser devices with power of more than 1 mW.

In Europe and the UK, due to the rising number of laser attacks in recent years, the power limit for lasers sold legally was downgraded from 5 mW to just 1 mW.

In the US, it’s completely legal to own lasers of any power and any class as long as they’re FDA-compliant. This means that the laser product has to pass certain criteria like having an interlock switch, reliable safety features, and quality control.

However, it’s illegal to sell laser products with a power greater than 5 mW while being branded as “laser pointer” or marketed for pointing purposes. Such devices are considered by law to be non-compliant or illegally labeled.

It’s worth noting though that the regulations prohibit selling them but not owning them. It’s also important to check the local laws as they vary between states.

Despite the fact that laws and regulations concerning the safety of laser devices differ between countries, there are some rules that exist in almost every country in the world.

Such global illegal offenses include pointing a laser beam at vehicles on the road or passing aircraft which could cause damage to the driver or the pilot’s eyes and endanger the plane.

In the US, this crime is punishable by up to five years in federal prison and a fine of up to a few hundred thousand dollars, according to the law signed by President Obama on the 14th of February 2012. A similar law is also enforced in the UK.

Shining a laser light at a police officer or a law enforcement official is also considered a criminal offense in many places.


1. What is the Strongest Type of Laser?

With modern technology, lasers are becoming more powerful than ever.

Today, the strongest laser beam is around 2,000 trillion watts.

To be sure, these numbers are hard to grasp. But to give you an idea, it’s a billion times brighter than stadium floodlights (and those are pretty bright already!)

But you might be curious, “What are these ultra lasers used for?”

A lot.

For one, it’s beneficial to healthcare. It produces ultra-high-quality X-rays without the need for radioisotope particles.

It’s also for alternative clean energy generation, as well as nuclear fusion research, cancer therapy, and a whole lot more.

So to answer the question: the strongest type of laser is the Laser for Fast Ignition Experiments (also called LFEX).

2. What is the Most Powerful Laser Color?

To answer this, we first have to determine what you mean by powerful. I mean, the answer varies depending on the meaning.

If you mean the brightest, then the most powerful laser color is green.

If you combine different colored lasers with the same mW, you’ll notice that the green always shines brightest.


This is because our eyes’ sensitivity peaks with the green region spectrum. Longer wavelengths (red) and shorter ones (blue) decrease the sensitivity.

red has the longest wavelength, while violet takes the shortest

Red has the longest wavelength, while violet takes the shortest

So if you want a laser with bright and clear light, go for a green one.

Now, if you mean most powerful in burning abilities, the blue/violet lasers take the cake.

With their shorter wavelengths, these colors produce more energy. And with more energy comes more heat.

Are you looking for a good burner? Blue/violet lasers will be best at that. Of course, it’ll have to have a high mW as well.

3. What is the Most Dangerous Laser?

It’s hard to say which is the MOST dangerous.

However, any laser under the Class 4 category is considered a danger already.

As we mentioned, these lasers can damage the eyes, burn the skin, and even cause fire hazards if not used properly.

It’s best to stay away from these Class 4 lasers and let the professionals handle it.

That said, you should never use any laser (no matter how weak) to try and harm someone. Remember, this is illegal in almost all countries.


In most countries, the power levels allowed for lasers used by the public can’t exceed 5 mW. In Europe and the UK, it’s even less with lasers only up to 1 mW being legal.

In the US, you can own any laser device but selling laser pointers higher than 5 mW is illegal.

Finally, the safe use of all kinds of lasers is advised, no matter where or what power they are, to avoid any harm to anyone.

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