The OP should not own a laser of any kind from all of the idiot level questions posted----is just little child mentality accident looking for a place to happen is my guess or someone with serious problems much bigger than lasers.I logged back on after seeing your last post.
Wouldn't you think a 7W laser is basicly 7 times stronger than a 1W laser??
If you can't get over the fact of having a 1mm gap with your safety glasses, then you shouldn't be thinking of cutting thin metal..
If you didn't see the beam of your 1.5W laser with your glasses off, which i'm sure you did try without glasses, then your laser isn't 1.5W..
No adult member has ever ask the same type of questions obsessively and adding more ridiculous "should I" questions that nobody can answer over and over again when a young child could easily discern the answers without asking 10 times in ten ways about the same thing.
All of it leads to the Troll impression actually---which may be the case actually.
Could partially be a language gap if the OP's native language is not English