What does Maximum Permissible Exposure or MPE mean?
The Maximum Permissible Exposure level or MPE is the scientifically researched threshold whereby the laser radiation exceeds safe levels, and would cause harm to human tissue. There are two main MPE levels, one for skin and one eyes. As eyes are far more susceptible to damage and require less radiation to cause damage, in light show applications the MPE levels for the eye are the most important values to consider. The Laser Safety Standard 60825, and HSG95 have tables in them which detail the applicable MPE levels for the various situation that can occur in laser light show use.
