I believe the way that you get more laser wattage out of the tubes is with additional length, so the cradle for the 40w tube won’t be able to fit the 45w tube. There’s probably a long list of other reasons that you won’t be able to just drop in a more powerful tube but that’s the one I know off hand. A lot of this was disused here: Suggestion: PRO SAFE and BASIC PLUS
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