Thanks for your replies.
The picture below was a bold first try Although recognizable it has no detail in the picture at all. It was lasered on a Snapmaker Blank Wood Square 80x80mm (I believe that to be basswood). 1200mm/m @ 30% (the logo was 40% and is pretty deep!). Interval 0.1mm, laser is a true 5Watt.
I came to my senses and made a bitmap with a fountain fill from black to white to do some testing. Because the bike was way too dark, I thought to pick up the speed to 2000 mm/m and keep power at 30%. I did a more methodical focus on black anodised alu, and upped the interval to 2mm (I expected some white lines between the black burns, but it does not look like that).
The fountain fill follows the X axis. It is a jarvis generated by Lightburn itself. The lower bar is 20% power and the upper bar is 30% I recognize 3 areas, black, white and some messy midfield, but no fountainfil. Not sure if important, but the upper bar was angeled 30 degrees.
Maybe some “standard” testing files exist, where the guru’s can see artifacts on?