Hey I'm hoping someone might be able to help me here, I can't find much of a straight answer elsewhere online.. So I built a 100W laser cutter and used it somewhat sparingly over the last year; maybe an average of an hour a week or so, always kept the water chiller running, never used above 70% power. A couple days ago though, it all the sudden up and breaks out of nowhere! electricity started arcing on the ends and it looks like maybe a small hole got melted in the inner glass. I noticed a little water in the main glass area thats supposed to be airtight. I have no idea what happened. But anyways, the warranty was only 6 months, so I'm out of luck there, and I still have a bunch of Etsy Christmas orders to fill (I realize its too late now to get them done in time for christmas..). Anyways I guess the main part of my question is here. I found an 80W tube on ebay with free local pickup in my area, and I read somewhere online that you can use a one level down tube with a more powerful power supply, but not the other way around. So I can use an 80W tube with a 100W PSU, but not a 100W tube with an 80W PSU. Is that correct? If it is correct, do I need to do something like run it only at a max of 80% power? Or does it not work that way? If I run it at 100%, does it try to output more than 80W? I assume its bad for the tube? Although I was so careful not to go above 70% on my 100W tube to make it last longer and it ended up dying after only a year anyways, so now I feel like I wasted a lot of time I could have been cutting faster. I don't know, I thought the tube was supposed to last 10000 hours... Anyways, I really appreciate any help or insight you can give me! Of course I don't want the 80W tube to break immediately after getting it too haha.. TL;DR - Is it true that you can use an 80W laser tube with a 100 PSU? And if so, do you have to use it at special certain settings, like at 80% power? Thanks a lot!