I’ve made some measurements using a power meter behind some eyewear protection in order to validate them.

I tried with a fibre laser machine (1064 nm) and when I put the googles about 2 centimeters to the laser while its working, the instrument (behind the glasses) reads about 450 W/m2. Withiut the safety glasses it reads 900 W/m2.

I did the same using a 40W UV Lamp but this time the glasses and instrument are looking directly into the lamp (20 centimeters of separation). Without safety glasses it reads 6.5 W/m2 and with eyewear protection it reads 2.8 W/m.

Are my tests coherent or do I need to try something different?

Is there a standard of how many W/m2 are safe in each application