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CheeseHasLeafs, no, Class 1 and Class 1m is a new system, class IIIa etc is an old one. So, does anyone have a clue whether my calculations in a previous post are correct? Was anyone dealing with this standard before?

Thanks for the reply. I have checked that, but still a bit confused. For example, for Laser class 1 it says that MPE can not be exceeded when viewing a laser with a naked eye. According to this plot: If I am using a laser in a range 400-700nm, and emmiting light on a spot longer than 10s, I...

In some project I do, I am allowed to use only 1 and 1M classes of lasers according to EN60825 standard. I could not even find the standard itself, but nevertheless I have found the presentation about laser safety (attached). But still confused. What are the conditions (restrictions) to...