Lasers in Airsoft are always seen as non-essential and sometimes people fear them. If well-used, and used in the right circumstances and the right laser, it can even be very helpful for your gameplay. Usually most commercial grade lasers are allowed on Airsoft sites with the exception of blue lasers which usually have a far more powerful output.
In case you’re wondering what are considered “safe” lasers, most lasers with 5nW of power or under are safe. Of course the more under the 5nW you go the weaker the light will be and the harder it will be to see in a well-lit environment, including dimly lit environments.
Most Airsoft lasers you see lying around on eBay are way under 5nW, which makes them quite safe. However, most are rendered almost useless for Airsoft since the laser beam is so underpowered that in most medium to well-lit situations you’ll have a hard time seeing the laser, and sometimes even at close range!
So you want to go all the way to that limit and still maintain the level of safety where your opponents don’t need to wear laser safety glasses!
According to the FDA, with a 5nW laser, the reflexive blink of the eye will be enough to prevent any serious damage from these lasers. This usually causes temporary flash or blindness, but can injure the eye if you stare without blinking.