I am finding that my 150W Reci works just as well as my 100W Reci for engraving. I was concerned at first, but everything worked out fine. I also agree, the dot size is a lens / focal length determination (not a Reci W2 v W6 v W8 or power element). CERTAINLY the ignition voltage is higher in higher wattage lasers, but this is easily compensated by… faster jobs anyway (and faster movement). 
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