@jepho i agree with you 100% 1.19 is not strong enough. i believe that what support was trying to say is that because the laser is pointed away from the user (downward) you should never receive a full 1.6W to your eyes (because to do so you would have to have the laser pointed directly at your eyes). and once the light hits any surface it will diffuse to some degree (unless it hits a very well polished mirror?) but still when it comes to safety, play it safe, go with something that will protect you in the worst case so that you know it will protect you in every other situation. i think its also important to note that most plastics degrade with time, so the original OD will likely be higher then the the OD after a year, or 3 years. that is why i would recommend never staring at a class 4 laser, if you want to watch it do its thing, set up a camera (we all have old phones laying around right?) and watch it on a screen remotely, that is 100% safe (excluding normal eye strain caused by digital devices).