UV Laser Settings for Beginners: EZCAD and LightBurn Setup Guide
UV laser engravers are capable of results that no other desktop laser can match — clean marks on glass, precise work on heat-sensitive plastics, clear engraving on electronics, and detailed frosting on crystal. But when most beginners first open EZCAD2 after unboxing a ComMarker Omni 1 or similar machine, they hit the same wall: the settings system looks nothing like what they expected.
There's no power slider. There's no intuitive "low, medium, high" preset for glass. The parameters are frequency, Q-pulse, and depth — and the manuals that ship with the machines rarely explain what any of those words mean in plain language.
This guide fixes that. It explains the UV laser parameter system from the ground up, walks through EZCAD2 and LightBurn setup step by step, gives you real starting settings for the four most common material categories, and shows you the test-grid method that takes the guesswork out of dialing in new materials.
Why UV Laser Settings Feel Confusing at First (And Why They're Not)
The confusion mostly comes from one thing: UV galvo lasers don't work the way diode or CO2 lasers do. On a diode or CO2 laser, power is usually a percentage of maximum output — 50% power at 500mm/s is the kind of input you're used to. Easy to understand, easy to adjust.
UV lasers at 355nm control power delivery through two different variables: frequency (how many pulses fire per second) and Q-pulse (also called pulse width — how energetic each individual pulse is). There's no single "power %" dial that directly maps to what you're used to.
The good news: once you understand what frequency and Q-pulse actually do, the system becomes highly controllable. More controllable, in fact, than a simple power slider. The parameters feel technical at first but become intuitive quickly with hands-on testing.
Understanding the Key Parameters
Frequency
Frequency is measured in kHz and controls how many laser pulses fire per second. Higher frequency means more pulses per second, which means more total energy delivered over time and smoother, more even marks. Lower frequency means fewer pulses per second — each pulse is more separated, with more time between them.
For surface engraving on glass and most plastics, 30–80kHz is the typical working range. Higher frequencies (80kHz+) produce smoother fills and are good for large areas. Lower frequencies (20–40kHz) deliver more energy per unit area and are useful for deeper or more aggressive marks.
On a MOPA fiber laser, frequency is half of the color control equation (pulse width is the other half). On a UV galvo laser, it's primarily used to control total energy delivery and mark smoothness.
Q-Pulse (Pulse Duration / Q-Switch Delay)
Q-pulse is the UV laser's equivalent of pulse width — it controls the energy of each individual laser pulse. The naming varies by machine and software: you'll see it called Q-pulse, Q-switch delay, or pulse duration depending on the manufacturer.
Lower Q-pulse value = more energy per pulse. Higher Q-pulse value = less energy per pulse.
This is counterintuitive at first. A Q-pulse of 2 is more powerful than a Q-pulse of 8 on most UV machines. Think of Q-pulse as a gate — a smaller gate opening lets more energy through per pulse.
For standard glass surface engraving, Q-pulse values between 3–7 are typical. For very aggressive marking or material cutting, lower values (1–3) increase per-pulse energy significantly. Start in the 4–6 range for most beginner applications and adjust from there.
Speed
Speed on a UV galvo laser (measured in mm/s) works much the same as on other laser types: faster speed means less time for the beam to interact with any given point, producing a lighter mark. Slower speed means more energy delivery per point, deeper or more aggressive results.
For glass surface frosting: 200–600 mm/s is typical working range. For finer detail on small designs: 100–300 mm/s. For scanning fills on large areas: 500–1,000 mm/s. Speed interacts directly with frequency — adjusting one without considering the other changes the total energy per unit area.
Focus Distance: The Most Important Variable
Of all the parameters, focus is the one that has the biggest impact on UV laser results — and the one most beginners underestimate. UV lasers have a very shallow depth of field. The beam is only at its minimum spot size (and therefore maximum energy density) within a very narrow range of distances from the lens. Move 0.5mm off focus and the spot expands noticeably. Move 1mm off and marks become soft, faint, and inconsistent.
For the ComMarker Omni 1 and similar UV galvo lasers with a dual red-dot focus system: the two red alignment dots converge to a single point on the material surface at the correct focal distance. Use the electric Z-axis motor to raise or lower the laser head until those two dots are as close together as possible.
Make a focus spacer — a piece of scrap acrylic or wood cut to the exact correct distance from the lens housing to the material surface. Your machine's manual specifies this distance for each lens. Cut a spacer to that height and use it every time to set focus consistently without the dot-convergence process. It takes 5 seconds and eliminates one of the most common sources of bad results.
For the full breakdown of how UV laser technology works on different glass types and why focus matters so much on curved surfaces, our UV laser engraving on glass guide covers the material science and settings methodology in depth.
Setting Up EZCAD for UV Engraving
EZCAD2 is the industry-standard software for galvo laser systems and ships with virtually every UV galvo laser including the ComMarker Omni 1. It's not visually polished by modern standards, but it's stable, powerful, and the professional standard in fiber and UV laser operation.
Installing and Connecting
- Copy the USB drive contents from your machine to your desktop before installing — never run directly from USB
- Open the folder matching your installed lens (110mm, 150mm, etc. — there will be separate folders)
- Run the EZCAD2 installer
- After installation, open EZCAD2 and go to File → Load Correction File → browse to the
.corfile in your lens folder - Connect your machine via USB, power it on, then click the lightning bolt / F1 to initialize
The .cor file is critical and specific to your lens. It compensates for the geometric distortion the field lens introduces at the edges of the working area. Without it, your marks will bow or distort. Match the .cor to the physical lens installed.
Creating Your First Job
In EZCAD2, "Pens" are how you assign laser parameters to different parts of your design. Each pen has its own frequency, Q-pulse, speed, and power percentage settings. Think of pens as material presets — you'll eventually have a pen configured for glass, one for acrylic, one for anodized aluminum, etc.
To create a simple first job:
- Draw or import a small shape or text in the workspace
- Make sure it's assigned to Pen 0 (default)
- Double-click Pen 0 in the pen list on the right to open its parameters
- Set your frequency, Q-pulse, speed, and power
- Click Mark to run (always have material in place and safety glasses on first)
Before running any real job, use the Red Light Preview function (circle/arrow icon in the toolbar) to preview the bounding box position on your material. This confirms your design will land where you expect.
Running a Test Grid
This is the single most important thing you can do as a UV laser beginner, and it's more important on UV lasers than on any other type because the parameter system has more variables.
Design a grid of small squares — typically 10–15mm per square — in a 4×4 or 5×5 layout. Vary frequency across one axis (e.g., 30kHz, 40kHz, 50kHz, 60kHz) and Q-pulse across the other (e.g., 2, 4, 6, 8). Engrave the full grid on scrap material of the type you plan to use. Photograph it under consistent lighting. Label each square with its parameters.
This grid becomes your reference library for that material. Every good UV laser result you'll ever produce starts from a grid like this. The time investment is 20–30 minutes and it prevents days of frustrating troubleshooting.
Setting Up LightBurn for UV Engraving
LightBurn is the preferred software for many makers because of its more intuitive visual interface, strong community, and the ability to manage complex multi-layer designs more easily than EZCAD2. Most UV galvo lasers support LightBurn, though the Galvo plugin is required and sold separately.
Plugin vs Native Support
LightBurn's standard installation does not natively support galvo lasers (UV, fiber, CO2 galvo). The LightBurn Galvo plugin ($30–$40 depending on license tier) adds galvo support. This is separate from the standard LightBurn gantry laser license, so if you already use LightBurn for a diode or CO2 gantry machine, you still need the additional Galvo plugin.
Note: some machines have limited LightBurn support. For example, the LaserPecker LP5's fiber laser requires the manufacturer's own Design Space for full frequency and pulse width control; LightBurn only handles the diode. Always verify full LightBurn compatibility for your specific machine and laser type before purchasing the plugin.
For the ComMarker Omni 1, Omni X, and Omni XE series, full LightBurn Galvo support is confirmed — frequency, Q-pulse, and all UV parameters are accessible. For a full look at the Omni 1's workflow and real-world results, our ComMarker Omni 1 review covers the machine in detail.
Configuring Parameters in LightBurn
Once the Galvo plugin is installed:
- Go to Devices → Create Manually → BJJCZ (the controller type for most UV galvo lasers)
- Set your working area dimensions to match your installed lens
- Load your
.corcorrection file: Edit → Machine Settings → Galvo Device Settings → browse to your .cor file - In the Cuts/Layers panel, each layer has Speed and Power settings — but UV galvo lasers also need frequency and Q-pulse, which appear in the Additional Settings or as layer-level parameters once the Galvo plugin is active
LightBurn's material library system is one of its strongest features — you can save complete parameter sets (speed, power, frequency, Q-pulse) for each material and share them across the community. Importing a community-shared parameter library for your specific machine gives you tested starting points immediately.
The LightBurn community and forums are significantly larger than EZCAD2's online presence, which means more tutorials, more shared parameter files, and better troubleshooting resources for beginners. For pure usability, most users find LightBurn the more enjoyable environment once the initial setup is complete.
Starting Settings by Material
These are starting-point parameters for a 5W UV galvo laser (ComMarker Omni 1 or similar) with a 150mm field lens. They are starting points — not guaranteed correct settings. Every machine batch, every material surface finish, and every ambient condition introduces variation. Always test on scrap first.
Glass
Glass is the UV laser's signature material and one of the most rewarding to work with once you understand it.
Surface frosting (standard wine glass, tumbler, ornament):
- Frequency: 30–50kHz
- Q-pulse: 3–5
- Speed: 200–400 mm/s
- Passes: 1–2
- Hatch spacing: 0.05mm
For darker, higher-contrast frosting: reduce frequency to 20–30kHz or reduce Q-pulse to 2–3, one at a time. For lighter, more subtle frosting: increase frequency to 60–80kHz or increase Q-pulse to 6–8.
If you're getting micro-cracking (tiny fractures radiating from the mark): energy per unit area is too high. Increase speed, increase frequency, or add passes at reduced settings rather than single high-power passes. For curved surfaces like wine glasses, use the rotary attachment to keep focal distance consistent as the glass rotates.
Plastics (Acrylic, ABS, Polycarbonate)
UV cold processing handles heat-sensitive plastics that diode and CO2 lasers often melt or discolor. The 355nm wavelength interacts photochemically rather than thermally, so these materials mark cleanly.
Clear acrylic / PMMA:
- Frequency: 40–70kHz
- Q-pulse: 4–7
- Speed: 300–600 mm/s
- Passes: 1
ABS and polycarbonate:
- Frequency: 30–60kHz
- Q-pulse: 3–6
- Speed: 300–500 mm/s
- Passes: 1–2
Start conservatively on any plastic — the UV cold process is gentle, but too much energy still discolors or etches deeper than intended on sensitive polymers. The goal for surface marking on clear or light-colored plastic is a sharp, legible mark with no surrounding heat zone.
For a comprehensive breakdown of which materials work best with UV laser technology, including the full comparison between UV, fiber, and CO2 performance per material category, see our guide to materials UV lasers can engrave.
Coated and Anodized Metals
UV lasers mark coated metals by removing the coating to reveal the substrate beneath — similar to how CO2 works on powder-coated tumblers, but with cleaner edges and less heat spread. Anodized aluminum is one of the most popular UV laser applications.
Anodized aluminum (standard anodized surface):
- Frequency: 40–80kHz
- Q-pulse: 4–7
- Speed: 500–1,000 mm/s
- Passes: 1
For anodized aluminum, the goal is to remove just the anodized layer to reveal the lighter aluminum beneath. Less energy is better — start at the high frequency / high Q-pulse / high speed end and work toward more energy only if the mark is too faint.
Painted metal (powder-coated, spray-painted):
- Frequency: 30–60kHz
- Q-pulse: 3–6
- Speed: 400–800 mm/s
- Passes: 1–2
Wood
Wood is a pleasant surprise for UV laser users — the UV process produces very clean engraving with minimal smoke staining or char halo compared to diode and CO2 lasers.
Birch plywood, basswood (surface engraving):
- Frequency: 20–40kHz
- Q-pulse: 2–5
- Speed: 300–600 mm/s
- Passes: 1–2
For photo engravings and grayscale work on wood, vary frequency and Q-pulse across a test grid to find your tonal range — lower energy produces lighter tones, higher energy produces darker tones. The UV laser's fine spot size (typically 0.0019mm on the Omni 1) enables detail on wood that rivals results from higher-powered systems.
If you're deciding between 5W and 10W for wood cutting applications, our 5W vs 10W UV laser guide covers the practical differences in cut depth and speed at both power levels.
The Test-and-Iterate Method That Actually Works
The fastest path to consistent UV laser results is not reading parameter charts — it's systematic testing. Here's the process that works:
Step 1: Build your first test grid. 4×4 or 5×5 grid of small squares. Vary frequency across rows, Q-pulse down columns. Engrave on scrap of your target material. Photograph and label every square.
Step 2: Identify your baseline. Find the square that produced the best result for your goal (clearest frosting, cleanest edge, right contrast level). Note those exact parameters.
Step 3: Refine with a second grid. Using your baseline as the center, make a tighter grid varying ±one step of frequency and ±one step of Q-pulse. This narrows your sweet spot.
Step 4: Test speed variation. With frequency and Q-pulse fixed at your sweet spot, vary speed across a row of small squares. This shows how speed affects total energy delivery at your parameters.
Step 5: Save and document. Write down the complete parameter set that works. In EZCAD2, save it as a named Pen configuration. In LightBurn, add it to your material library. Label it clearly: "Omni 1 – 150mm lens – Birch 3mm – Surface engraving – [date]."
Every good UV laser operator has a parameter library built from exactly this process. The grid takes 20 minutes. The documentation takes 5 minutes. The time saved on every future job is immeasurable.
Common Beginner Mistakes to Avoid
Skipping the focus step. Refocus every time you change material thickness. Make a focus spacer so you can do it in seconds. Every blurry, faint, or inconsistent mark traces back to focus 80% of the time.
Not loading the .cor correction file. Without it, marks bow and distort at the edges of the working area. Match the .cor file to your physical lens. Keep a backup copy on your desktop.
Using a percentage-based mental model. "I'll try 50% power" makes no sense on a UV laser — there's no single power percentage. Think in terms of frequency + Q-pulse as the energy control system.
Increasing power aggressively when results are faint. More often, faint results mean slightly wrong focus or a Q-pulse value that's too high. Check focus first. Reduce Q-pulse by 1–2 steps. Only increase frequency or reduce speed after ruling out focus as the cause.
Engraving on dirty or handled surfaces. Fingerprint oils, packaging residue, and machining oils on glass or metal change how the surface oxidizes and absorbs UV energy. Clean with IPA and handle with nitrile gloves for consistent results.
Not keeping records. The single most common complaint from UV laser beginners is "I got a great result once and can't reproduce it." Write down every parameter set that works. This is non-negotiable if you plan to run any kind of production.
Next Steps
Once you've worked through the test grid process on your primary materials and have a reliable parameter library started, the natural next steps are:
Expand your material range. Ceramics, leather, slate, food surfaces, PCBs — UV lasers handle a wide range of substrates. Each needs its own test grid. The same methodology applies to every new material.
Build your LightBurn material library. If you're using LightBurn, invest time in setting up a complete material library with named, documented entries for every material you regularly use. It's the single best investment in workflow efficiency you can make.
Explore 3D subsurface engraving on glass. If your machine supports motorized Z-axis (Omni X, Omni XE, or similar), 3D crystal engraving is the natural next capability to develop. The parameter foundation you've built for surface engraving transfers directly.
Join the community. LightBurn forums, ComMarker's community groups, and UV laser Facebook groups all have large libraries of shared parameters, tutorials, and troubleshooting help. The community knowledge base for UV laser settings has grown enormously in the past two years.
Frequently Asked Questions
How is power controlled on a UV laser if there's no power percentage?
UV galvo lasers control effective power through two variables: frequency (kHz — pulses per second) and Q-pulse (the energy per individual pulse). Higher frequency delivers more total energy over time. Lower Q-pulse value delivers more energy per pulse. Speed (mm/s) determines how long the beam dwells on each point. The combination of these three variables — frequency × Q-pulse × speed — determines the total energy delivered to the material surface. There's no single "power %" slider, which is why UV laser settings feel different at first. Once you understand the system, it's actually more controllable than a simple percentage-based approach.
What is the most important setting to get right on a UV laser?
Focus distance. The UV laser's very shallow depth of field means even a small deviation from the correct focal distance significantly degrades mark quality. A properly focused UV beam produces crisp, high-contrast marks; an out-of-focus beam produces soft, faint, inconsistent results at the same frequency and Q-pulse settings. Every time you change material thickness, refocus. Every time results are worse than expected, check focus before adjusting any other parameter.
What's the difference between EZCAD2 and LightBurn for UV laser engraving?
EZCAD2 is the industry-standard software for galvo lasers — it ships with most UV galvo machines, offers deep parameter control, and is the most widely used in professional and industrial settings. LightBurn (with the Galvo plugin) provides a significantly more intuitive visual interface, stronger community support, better material library management, and broader design tool accessibility. Both access the same laser hardware capabilities. Beginners generally find LightBurn easier to learn; experienced laser operators often appreciate EZCAD2's direct parameter access. Many users run both: EZCAD2 for precise parameter testing, LightBurn for day-to-day production workflows.
What is Q-pulse and why does a lower number mean more power?
Q-pulse (sometimes called Q-switch delay or pulse duration) controls the gate timing of the laser's Q-switch — the mechanism that determines when the energy stored in the laser cavity is released. A smaller Q-pulse value means the gate opens more quickly after the energy storage period, releasing more concentrated energy per pulse. A larger value means the gate opens more slowly, releasing less energy per pulse. The counterintuitive "lower = more powerful" relationship is a function of the Q-switch timing mechanism. In practice: start with Q-pulse 4–6 for most surface engraving applications and adjust based on your test grid results.
Why is my UV laser leaving no mark on glass?
The two most common causes are: focus distance is wrong (the most frequent issue — even 0.5–1mm off focus significantly reduces energy density at the surface), or the Q-pulse value is too high with frequency too low for the material. Check focus first using the two-dot convergence method, then run a test grid varying Q-pulse and frequency before concluding there's a hardware problem. Clear glass does require slightly higher energy than you might expect — try reducing Q-pulse to 2–3 and frequency to 25–40kHz as a starting diagnostic. Also verify the .cor correction file is loaded in your software.
Do I need to use both EZCAD2 and LightBurn, or just one?
You only need one for daily production, but it's worth having both installed. Use whichever you find more intuitive for day-to-day workflow — most makers settle on LightBurn for its community and material library features. Keep EZCAD2 installed because it's the reference software for parameter testing, it's needed for some advanced functions (3D embossing on some machines), and some manufacturer support documentation assumes EZCAD2. The .cor correction file needs to be loaded in whichever software you use.
How long does it take to get good results from a UV laser as a beginner?
Most beginners can get clean, professional surface engravings on glass within 2–4 hours of hands-on time, including setup and the first test grid session. Expanding to consistent results across multiple materials typically takes a few dedicated sessions of testing and documentation — usually 1–2 weeks of regular use. Advanced applications like 3D crystal engraving require more practice with file preparation and Z-axis parameter management, typically a few weeks after mastering surface engraving. The learning curve is steeper than a diode laser but significantly shorter than most beginners expect, as long as you use the test-grid methodology rather than trying random settings.
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