Finding the right laser engraving parameters does not have to rely on repeated guesswork. LightBurn includes a built-in Material Test tool that allows you to test different combinations of parameters in a structured matrix and quickly identify a suitable processing range for your material.

In this guide, we will show you how to use LightBurn Material Test to find reliable laser settings through a step-by-step testing process. Our example uses an EM-Smart Dual 2 to mark a metal business card, with speed and power as the main variables.

The goal is not simply to find the sample that looks best. A truly useful parameter set should also provide good processing efficiency, sufficient tolerance for small variations, and consistent results during repeated production.

Before Starting a LightBurn Material Test

Before testing, keep the hardware condition of your laser system unchanged. Do not move the machine, lens, workpiece position, or focus during the test. A change in any of these conditions can affect the engraving result and make it difficult to compare one parameter combination with another.

For this test, we will use power and speed as the variables. Other settings, including frequency, pulse width, line interval, resolution, and related processing parameters, should remain fixed throughout the test. This ensures that the differences you see in the test matrix are primarily caused by changes in power and speed.

It is also important to prepare a clean and consistent test surface. We recommend starting with a uniform standard test plate rather than immediately testing a finished product. Clean the material surface to remove oil, fingerprints, dust, or other contamination that could interfere with your evaluation.

How to Open Material Test in LightBurn

Open LightBurn and go to Laser Tools → Material Test. In this example, the X-axis is used for speed and the Y-axis for power. After entering the desired ranges, preview the matrix to make sure it fits your test material, then start the engraving process.

The purpose of the matrix is to engrave multiple combinations of power and speed in a single test. Instead of manually changing one setting and engraving again each time, you can visually compare many parameter combinations at once.

Round 1: Start With a Wide Parameter Range

The first test should cover a relatively wide range. The purpose is not to find the final setting immediately, but to eliminate obviously unsuitable parameters and identify a smaller area worth testing in more detail.

In our example, the initial Material Test uses a power range of 10% to 100% and a speed range of 100 to 5000 mm/s. LightBurn then generates a matrix containing multiple combinations within these ranges.

After the test is complete, visually inspect the samples and select approximately two or three areas that appear promising. At this stage, they do not need to be perfect. You mainly want to eliminate combinations that produce almost no visible mark, severe burning, excessive blackening, or large amounts of unwanted white or black spots.

Round 2: Narrow the Range for a More Precise Test

Once you have identified a promising area, use those results as the center of a second test. Narrow the power and speed ranges and increase the number of test steps. This gives you a much more detailed comparison around the settings that performed well in the first round.

For example, suppose the first test indicates that approximately 70% power and 1500 mm/s produces a promising result. The second test could narrow the range to approximately 20–70% power and 800–2200 mm/s.

From this smaller matrix, choose the parameter combination that best matches your product requirements. For example, you may find that 50% power and 1800 mm/s provides the best balance for the material being tested.

Save the test parameters so that you can return to them later. Then exit Material Test, import the actual text or artwork you plan to engrave, and test the selected settings on a real design.

How to Decide Which Laser Settings Are Actually the Best

This is the most important part of the process. A test square that looks good does not automatically mean that the parameter combination is suitable for real production. We recommend evaluating the candidate settings from four perspectives: appearance, processing efficiency, tolerance, and repeatability.

First, check whether the engraving meets your visual requirements. The depth, darkness, clarity, and overall appearance should meet your product standard without obvious white spots, burning, or burrs.

Next, consider processing efficiency. If two parameter combinations produce similarly acceptable results, the faster setting is usually preferable. Excessively slow engraving reduces production efficiency and can also increase heat accumulation, which may cause the result to change during longer production runs.

Why Parameter Tolerance Matters for Production

Real production conditions are never perfectly identical. Material batches may vary slightly, and the height or positioning of individual workpieces can also change by a small amount. For this reason, the best laser setting should have a reasonable operating window rather than working only at one extremely precise point.

A simple way to check tolerance is to take your candidate setting and test it again while adjusting the power approximately ±10%. If the engraving remains acceptable after these small changes, the parameter has a useful tolerance range and is more suitable for practical production.

If a very small parameter change immediately causes the engraving to fail, the original setting is likely too close to a critical boundary. It may look excellent on one test sample but can easily produce inconsistent results during batch production.

Check Repeatability Before Finalizing Your Settings

After confirming the appearance and tolerance, use the candidate parameters to engrave the same design five consecutive times. Compare all five samples carefully.

If the results remain essentially consistent without gradually becoming lighter, darker, or otherwise changing, the parameter set can be considered stable. If the appearance changes significantly as processing continues, the setting should not yet be treated as your final production parameter.

Only after the settings meet the requirements for appearance, efficiency, tolerance, and repeatability should they be considered reliable engraving parameters.

Verify the Settings on Your Actual Product Material

A standard test plate is useful for identifying a suitable parameter range, but it cannot completely replace testing on your actual product. Different batches, coatings, surface treatments, and material compositions can produce different laser responses.

After finding a stable parameter set on the standard test plate, repeat the test on the material you actually intend to engrave. If the result does not fully meet your requirements, make small adjustments around the candidate settings rather than starting the entire search again.

Save Your Final Laser Settings in LightBurn

Once the parameters have passed all of the tests, save them for future use. Record not only power and speed, but also the LightBurn configuration, lens used, focus condition, and other settings that could affect the result.

In our example, the test record includes the LightBurn file configuration, an F=290 mm lens, and engraving at the correct focal position. Keeping this information together makes it much easier to reproduce the same result later.

Why Not Run the Full Material Test Directly on Your Final Product?

Finished product materials are not always perfectly consistent from batch to batch. If you immediately run a large parameter matrix on the final product, it can become difficult to determine whether an inconsistent result was caused by the laser settings or by the material itself.

Using a stable standard test plate first helps isolate the parameter variables and reduces unnecessary material waste. Once you have identified a reliable range, you can confirm and fine-tune it on the actual product.

Why Do Good Test Settings Sometimes Fail During Batch Engraving?

If a parameter looks good during a short test but becomes inconsistent during batch processing, the setting may be too close to a critical boundary or may not have enough tolerance. Another possible reason is that the engraving speed is too low, causing heat to accumulate during repeated processing.

In this situation, return to the candidate settings and repeat the tolerance and consistency tests before using them for production.

Final Thoughts on Using LightBurn Material Test

The most reliable way to use LightBurn Material Test is to work from a broad range toward a narrow range. Start by identifying a promising processing window, refine the power and speed combinations, and then verify the result using your actual engraving design.

Most importantly, do not judge laser settings by appearance alone. A good production parameter should deliver the required engraving quality while maintaining reasonable processing speed, tolerance to small variations, and consistent results over repeated runs.

Once you have found that stable operating range, verify it on your actual material and save the complete configuration in LightBurn. This turns Material Test from a simple parameter comparison tool into a repeatable method for developing reliable laser engraving settings.