A laser test grid is a planning sheet, not a database of guaranteed settings. It gives you labelled, separate cells so you can work methodically on your own laser and material. Wood, slate, acrylic, metal coatings, focus, air assist and optics can all change the result.
What the SVG actually contains
The tool creates a normal SVG table: each test cell is a separate object and the labels show intended power and speed values. It does not command a laser, select a material preset or change settings inside LightBurn, LaserGRBL or any other software.
Choose a practical range
Set a minimum and maximum power, a minimum and maximum speed in mm/min, the number of steps and the physical cell size. Begin with a compact 4×5 or 7×7 grid when you are learning a material. Use larger grids only when you have enough material and a reason to test more combinations.
Assign settings in your laser program
Import the SVG into your program. Keep every cell separate, place or duplicate them as your workflow requires, and assign the matching power and speed for each labelled square. The labels are a record for you; the machine uses the settings you choose in its own software.
Run a safe material test
Use a scrap piece from the same batch, confirm focus and ventilation, and stay with the machine. Start with conservative settings. Do not treat an online value as safe for your laser or material. Record the cell that looks best and note machine, lens, material, thickness and date.
Read the result
For engraving, look for the desired contrast with clean detail and no unwanted scorching. For cutting, inspect whether the piece releases cleanly and whether the back is acceptable. A setting that looks good on the surface may still be unsuitable for a production run, so repeat a narrow test before a valuable job.