Refer to the image here for the Exposure Hazard
Values (EHV) in accordance with the IEC62471-5 standard. The EHV
indicates the hazard level for objects in front of the light source
for 0.25 seconds at a distance of 7.9 inches (20 cm). The higher
the value, the greater the hazard level.
Looking into the lens at distances closer than those indicated here
can cause damage to eyesight.
using projectors and interchangeable lenses that change to Risk
Group 3, no direct exposure to the beam is permitted. Operators
must control access to the beam within the hazard distance or
install the product at a height that will prevent eye exposure
within the hazard distance.