Jay, most lasers have an option for dual cutting heads which allows you to cut/engrave two parts simultaneously, and some (like mine) have an option for two laser cartridges, my reason was simply wanting increased power but there are other advantages to that as well, if you have the dual heads you can have more power per head instead of splitting the beam between both heads, the other one is the ULS "superspeed" feature which allows both beams to fire at the same time through a special lens that effectively doubles the engraving speed.
Universal PLS 6.120D 75 watt
MutiCam Apex CNC 4'x8' w 6 bit TC.
EnrRoute 6 Pro 3d software.
Vision 2550 Rotary Engraver.