The dangers associated with level 4 laser power are so serious that it is impossible for ordinary people to own it. However, the power of the Level 4 laser also benefits society in many ways. Applications include surgery, research, drilling, cutting, welding, and micromachining. Class 3R / 3A lasers are much safer for recreational use than Class 4 lasers, but may not be safe if used or manufactured carelessly. The laser classification system was created in the early 1970s, revised in 2007, and then approved by the FDA. The system is an important part of laser safety, can display the laser danger level, and sell and own USB laser Pointers. The ratings range from low (level 1) to severe (level 4), depending on how much damage the laser can cause to humans. The likelihood of laser damage is measured primarily by milliwatt output related to wavelength and exposure time.
In addition to their intensity, there are several properties that make green lasers different from red or blue lasers. Green lasers are the only ones that work well outdoors. The green Laser Pointer has a range of up to a mile and works best at night, making it the brightest choice overall. So what's the difference between a dangerous, illegal green laser and a safe, legal one? A major factor is the legal milliwatt limit. In order for the laser to be legal in the United States, it must be less than 5 mW. Laser Pointers are dangerous when pointed at people, vehicles or aircraft. Green lasers carry a risk of exposure to infrared light, which can be dangerous to the human eye if used improperly. However, as with any other situation, a green laser pointer is not dangerous if it is created correctly and used safely.