If folks want I can start a different thread about this. I know the talk of lasers was deadly not so long ago. But here is the thing, some of us bought expensive custom irons or wood burning sets to brand our logo or name on things we sell. The irons are consistent but custom engraving with a wood burner takes some real skill.
Iggy is doing some beautiful work and personalizing it. With a laser engraver you can use any font and scale that you want.
All of the information bellow is things that I have found in my digging. I should have done this before buying the laser that I have.
I am no expert by any means, but I did use an industrial laser for many years to precisely cut Silicone wafers into custom shapes.
First all of these smaller laser power ratings are misleading. the 3.5 , 7, 20 watt are in reality the power consumed by the entire unit, NOT the power of the laser.
The actual power of a 7w (7000mw) laser is only 2.5watts. the 20w laser is only 5.5w.
Most of these NEJE lasers with their controller and software only turn the laser on and off, If you want o burn gray scale images you want a laser with Puls width modulation. In english that means it has to capability to vary the laser intensity as it goes along.
LaserGrbl is a control software http://lasergrbl.com/ that will do this as long as the laser is compatible.
As far as cutting goes,these lasers have a very narrow focal point so these small lasers even the 5.5W (advertised as 20) will only cut
"The 5.6 watt laser easily cuts plywood and acrylic 3-5 mm (0,1-0,2″) thick, and it even cuts plywood 8 mm (1/3″) thick with many passes (requires Z axes for that)."
The "z" axis will move the laser up and down to maintain the focus. The cheaper laser have to be focused manually.
If you want to primarily cut you will need a more powerful laser, that will require, water cooling etc.