​Do you have a OMTech (formally Orion Motors) laser and are using Lightburn with it?  This is a premade library of cutting speeds and power for various woods, plastics, and other materials.  These are my personal settings I use on my 60w machine.
Just open Lightburn and click on the libraries tab at the bottom right.  Click on import and select the file below that you just downloaded.  Now you'll no longer have to guess at what settings you'll need to use on your material!