# Laser Engraver Wattage Explained: Optical vs Input Watts

> Why an "80W" laser engraver can be a 10 W laser: optical vs electrical watts, misleading listing titles, CO2 tube ratings and why types don't compare.

- Source: https://laserengraversguide.com/posts/laser-engraver-wattage-explained/
- Markdown version: https://laserengraversguide.com/posts/laser-engraver-wattage-explained.md
- Last updated: 2026-10-30

---

- [Home](https://laserengraversguide.com/)
- [Guides](https://laserengraversguide.com/guides/)
- Laser Engraver Wattage Explained: Optical vs. Electrical Watts

 Explainer
# Laser Engraver Wattage Explained: Optical vs. Electrical Watts
  Updated October 30, 2026 By [Laser Engravers Guide Editorial Team](https://laserengraversguide.com/about/) [How we research](https://laserengraversguide.com/how-we-research/)

Prices are approximate and change often, so check the current price before you buy.

## Key takeaways

- A laser has three power numbers: **optical output** (the light that cuts), the laser module's electrical draw, and the whole machine's input. Only optical output tells you what it can do.
- Listing titles often use the bigger numbers: Creality's Falcon A1 "80W" is 10 W optical and the A1 Pro "180W" is 20 W.
- CO2 tube ratings like OMTech's "45W" aren't measured outputs, and glass tubes fade with use.
- Watts don't compare across laser types. A 20 W fiber, a 20 W diode and a 55 W CO2 do different jobs because materials absorb each wavelength differently.

## Our top picks

- 1![Creality Falcon A1 10W](https://laserengraversguide.com/_astro/creality-falcon-a1-10w.xF0nr-n8_2h22eC.webp)Sold as "80W": 10 W of optical output[Creality Falcon A1 10W](https://laserengraversguide.com/laser-engravers/creality-falcon-a1-10w/)10 W diode · Enclosed · 381 × 305 mm7.9**$$**$$Mid-rangePrice tier: Mid-range[Check price on Amazon](https://www.amazon.com/dp/B0DRVQNYQ1?tag=laserengraversguide.com-20)
- 2![Creality Falcon A1 Pro 20W](https://laserengraversguide.com/_astro/creality-falcon-a1-pro-20w.uHe_1xlH_oxTpc.webp)Sold as "180W": 20 W of optical output[Creality Falcon A1 Pro 20W](https://laserengraversguide.com/laser-engravers/creality-falcon-a1-pro-20w/)20 W diode · Enclosed · 358 × 268 mm8.2**$$**$$Mid-rangePrice tier: Mid-range[Check price](https://www.amazon.com/dp/B0FDFFN85C?tag=laserengraversguide.com-20)
- 3![OMTech K40+ 45W Desktop CO2 Laser](https://laserengraversguide.com/_astro/omtech-k40-plus-45w.BEOGj9sl_2oxI3U.webp)"45W" is a CO2 tube rating, not a measured output[OMTech K40+ 45W Desktop CO2 Laser](https://laserengraversguide.com/laser-engravers/omtech-k40-plus-45w/)45 W co2 · Enclosed · 300 × 200 mm7.0**$$**$$Mid-rangePrice tier: Mid-range[Check price](https://www.amazon.com/dp/B0DFM5L5MD?tag=laserengraversguide.com-20)

### On this page 7 sections

- [Three numbers called “power”](#three-numbers-called-power)
- [Listing titles vs. real output](#listing-titles-vs-real-output)
- [Not all optical watts are equal, even within a type](#not-all-optical-watts-are-equal-even-within-a-type)
- [Why watts don’t compare across laser types](#why-watts-dont-compare-across-laser-types)
- [How many watts do you actually need?](#how-many-watts-do-you-actually-need)
- [Bottom line](#bottom-line)
- [FAQ](#faq)

## Before you choose

- [How to Choose a Laser Engraver: Type, Format, Power, Size and Software](https://laserengraversguide.com/posts/how-to-choose-a-laser-engraver/)
- [Diode vs CO2 vs Fiber Laser: Which Type Do You Actually Need?](https://laserengraversguide.com/posts/diode-vs-co2-vs-fiber-laser/)
- [Creality Falcon A1 vs Falcon A1 Pro: Is the 20 W Upgrade Worth It?](https://laserengraversguide.com/posts/creality-falcon-a1-vs-falcon-a1-pro/)

Search Amazon for a laser engraver and you’ll see “80W”, “120W” and “180W” in listing titles next to machines that cost less than a phone. Then a 55 W CO2 costs ten times more. Both can be true at once, because the watts aren’t measuring the same thing. This explainer covers what each number means, how to find the real one, and why even honest watts don’t compare across laser types. Every figure comes from our [comparison data](https://laserengraversguide.com/laser-engravers/) and the makers’ own spec sheets.

## Three numbers called “power”

xTool’s own buyer guide lays out three different power ratings you’ll see on laser machines:

- **Optical (output) power:** the laser light that leaves the module and reaches the material. This is the number that cuts and engraves.

- **Laser electrical power:** the electricity the laser module draws. It tells you about consumption, not capability.

- **Machine power:** what the whole machine draws from the wall, including motors, fans and controller.

Machine power is always the highest and optical power the lowest. xTool’s example: a diode machine with 10 W optical power, 40 W laser electrical power and 60 W machine power. A diode turns only part of its electricity into light; the rest becomes heat. xTool adds that some companies quote the electrical figure instead of optical power, so always compare optical output.

Our data stores optical output only for every machine, which is why our numbers often look smaller than the listing titles.

## Listing titles vs. real output

| Machine | What the listing or title says | Optical output in our data |
| --- | --- | --- |
| [Creality Falcon A1](https://laserengraversguide.com/laser-engravers/creality-falcon-a1-10w/) | “80W” | 10 W (listing states “Power Output Level 10000mW”) |
| [Creality Falcon A1 Pro](https://laserengraversguide.com/laser-engravers/creality-falcon-a1-pro-20w/) | “180W” | 20 W (listing states “power output level 20000mW”) |
| [Atomstack A20 Pro V2](https://laserengraversguide.com/laser-engravers/atomstack-a20-pro-v2/) | 120 W input | 20 W from a dual-beam module |
| Atomstack A40 Pro V2 | “48W” | 40 W per Atomstack’s own comparison table |
| [xTool F2](https://laserengraversguide.com/laser-engravers/xtool-f2/) | 150 W max input | 15 W diode + 5 W IR |
| [OMTech K40+](https://laserengraversguide.com/laser-engravers/omtech-k40-plus-45w/) | “45W” | 45 W tube rating, not a measured output |

None of these listings is hiding the real figure. Creality prints the milliwatt output in the listing body. But the big number is the one in the title, and the title is what most shoppers compare. A “180W” A1 Pro isn’t 18 times a 10 W M2; it’s twice.

### How to find the real number

- **Search the listing and spec table** for “optical”, “output” or “mW”. 10,000 mW = 10 W.

- **Check the warning label and manual.** The FDA requires labeling on Class II–IV lasers to state the class and the output power.

- **Be suspicious of round, huge numbers** on cheap machines. In our data, the most powerful blue diodes are 40 W optical (the [xTool S1](https://laserengraversguide.com/laser-engravers/xtool-s1-40w/) and [Longer Ray5 40W](https://laserengraversguide.com/laser-engravers/longer-ray5-40w/)).

- **Ignore “equivalent” claims.** A diode isn’t “equivalent” to a CO2 of some wattage; they’re different tools, as covered below.

## Not all optical watts are equal, even within a type

### Multi-beam diode modules

Higher-power diode modules usually combine several emitters into one spot. Our data notes the A20 Pro V2 uses a dual-beam module and the Ray5 40W an 8-beam compressed module. The total is still optical output, but combining beams affects the spot. Longer specifies the Ray5 spot as 0.10 × 0.15 mm. A smaller spot concentrates the same watts into a smaller area, which matters for fine engraving and clean cuts. Two 20 W diodes with different spot sizes won’t perform identically, which is why maker cut claims and independent reviews matter more than the watt figure alone.

### CO2 tube ratings and aging

CO2 wattage is usually the tube’s rating. OMTech calls the K40+ “45W” and publishes no measured output; our data notes that glass tubes in this class typically deliver less than the label and fade with age. xTool gives specifics for its 55 W P2S: about 95% power at 1,000 hours and about 70% at 6,000–8,000 hours. A CO2 rating describes a new tube, so budget for replacement on a machine you’ll run hard.

### Fiber: average vs. peak

Fiber and IR lasers pulse. Their ratings are normally average output, and xTool states that the F2’s 15 W diode and 5 W IR figures are both average power. The peak power inside each pulse is far higher, which is part of why a 20 W fiber like the [ComMarker B4](https://laserengraversguide.com/laser-engravers/commarker-b4-20w/) deep-engraves stainless that a 40 W blue diode only marks faintly. Within fiber, the source type matters too: the B4’s 20 W is a standard Q-switched source, while the [F2 Ultra](https://laserengraversguide.com/laser-engravers/xtool-f2-ultra/)’s 60 W MOPA can color-mark stainless.

## Why watts don’t compare across laser types

  Four kinds of hobby laser The light source decides what a laser can cut and mark. The format decides speed, size and safety.

        Blue diode (open or enclosed)
        The affordable all-rounder: engraves and cuts wood, leather, cardboard and dark acrylic, and engraves coated metal. Can't cut clear acrylic or mark bare metal. Slower cutting than CO2.

         Typical: 10–40 W output, $300–$2,000

        CO2 tube
        The cutting machine: faster, cleaner cuts in wood and every color of acrylic, plus glass etching. Bigger, needs water cooling and serious venting. Can't mark bare metal without a compound.

         Typical: 40–55 W desktop, $2,000–$7,000

        Fiber (1064 nm)
        The metal specialist: marks and deep-engraves stainless, aluminum, brass, silver and gold, and many plastics. Poor at wood and useless for clear acrylic or cutting sheet goods.

         Typical: 20–60 W, $1,500–$5,000

        Galvo / portable
        Mirrors steer the beam instead of a moving gantry, so it's extremely fast over a small field — ideal for personalizing many small items. Often dual-source (diode + IR) in hobby machines.

         Typical: ~100 × 100 mm field, $500–$2,500

Materials absorb some wavelengths and ignore others. That, more than wattage, decides what a laser can do:

- **Blue diode (around 450 nm):** absorbed well by wood, leather and dark materials. Clear acrylic lets it pass straight through, so no blue diode cuts clear acrylic, whatever the watts.

- **CO2 (10.6 µm):** absorbed by wood, every color of acrylic and glass. It doesn’t mark bare metal without a compound.

- **Fiber and IR (1064 nm):** absorbed by metals. Poor on wood; the B4 won’t cut it at all.

Some examples from maker claims in our data:

| Machine | Power | What it claims |
| --- | --- | --- |
| [xTool S1](https://laserengraversguide.com/laser-engravers/xtool-s1-40w/) | 40 W blue diode | 18 mm cherry in one pass; no clear acrylic |
| [xTool P2S](https://laserengraversguide.com/laser-engravers/xtool-p2s/) | 55 W CO2 | 18 mm basswood and 20 mm acrylic, including clear, in one pass |
| [Falcon A1 Pro](https://laserengraversguide.com/laser-engravers/creality-falcon-a1-pro-20w/) | 20 W blue diode | 10 mm basswood; a slow dark mark on stainless |
| [ComMarker B4](https://laserengraversguide.com/laser-engravers/commarker-b4-20w/) | 20 W fiber | Deep engraves bare metal; doesn’t cut wood |

The S1 and P2S claim similar wood thickness, but the CO2 also cuts clear acrylic and, in our data, cuts thick stock faster. The A1 Pro and B4 have the same 20 W rating and almost no overlap in what they do well. So: choose the type from your materials first, then compare watts within that type. Our [diode vs CO2 vs fiber comparison](https://laserengraversguide.com/posts/diode-vs-co2-vs-fiber-laser/) and [material guide](https://laserengraversguide.com/posts/what-materials-can-a-laser-cut/) cover this in depth.

## How many watts do you actually need?

For blue diodes, measured in optical watts:

- **5–10 W** is plenty for engraving wood, leather, slate and coated metal, and cuts thin plywood and card. The [M2 10W](https://laserengraversguide.com/laser-engravers/xtool-m2-10w/) claims 8 mm basswood in one pass.

- **20 W** makes regular cutting of 3–6 mm sheet practical.

- **40 W** is for thick plywood and dark acrylic.

More power cuts deeper and faster, but it also means more smoke and a bigger fire risk, and it costs more. If you mostly engrave, a 10 W enclosed machine like the [Falcon A1](https://www.amazon.com/dp/B0DRVQNYQ1?tag=laserengraversguide.com-20) (about $549) does the job; its “80W” title doesn’t change that. The [laser matcher](https://laserengraversguide.com/tools/laser-matcher/) filters by what you want to make rather than by watts, which sidesteps the problem entirely.

## Bottom line

Read past the title to the optical output, usually printed in watts or milliwatts in the spec table or on the safety label. Remember that CO2 ratings describe new tubes and fiber ratings describe averages. And never compare watts across laser types: pick the type from your materials, then let optical watts rank the machines within it. Check today’s price and the exact module wattage before you order, because makers sell several power versions under one listing.

## Don't guess. Calculate.

- [🎯 Laser Matcher](https://laserengraversguide.com/tools/laser-matcher/): which lasers fit your projects
- [🧪 Material Checker](https://laserengraversguide.com/tools/material-checker/): what each laser can cut
- [💰 Profit Calculator](https://laserengraversguide.com/tools/profit-calculator/): cost, price and payback
- [📊 Compare every laser](https://laserengraversguide.com/laser-engravers/): sortable spec table

## Frequently asked questions

### Is an 80W laser engraver really 80 watts?
Usually not in optical terms. The Creality Falcon A1 is sold as "80W" but its Amazon listing states a power output of 10,000 mW, which is 10 W. The 80 W refers to electrical power, not the light that does the cutting.

### Where do I find a laser's real optical power?
Look in the spec table for "optical power", "output power" or a figure in milliwatts, not the listing title. The FDA requires labels on Class II–IV lasers to state the class and the output power, so the warning label and manual are good places to check.

### Is a 40 W diode as good as a 40 W CO2?
No. The wavelengths behave differently. A CO2 cuts faster, cleaner and handles clear acrylic, which a blue diode can't cut at any power. Compare watts only between lasers of the same type.

### What do the watts on a fiber laser mean?
Fiber and IR ratings are normally average output. They're pulsed, so peak power is much higher, which is part of why a 20 W fiber engraves metal a 40 W diode barely marks. xTool specifies the F2's 15 W diode and 5 W IR as average power.

## Sources

- [xTool: Fiber vs. CO2 vs. Diode Laser (laser power section)](https://www.xtool.eu/da/blogs/kobervejledning/fiber-co2-diode-laser-difference) · checked 2026-10-30 — Three power ratings: optical/output, laser electric and machine power; example of a diode with 10 W optical, 40 W electric and 60 W machine power; some companies quote electrical instead of optical power
- [FDA: Laser Products and Instruments](https://www.fda.gov/radiation-emitting-products/home-business-and-entertainment-products/laser-products-and-instruments) · checked 2026-10-30 — Labeling for Classes II–IV must include a warning symbol that states the class and the output power of the product
- [xTool Support: xTool F2 FAQ](https://support.xtool.com/article/2818) · checked 2026-10-30 — F2 uses a 445 nm diode at 15 W and a 1064 nm IR laser at 5 W output; both are specified as average power

## Get new guides by e-mail
One short e-mail when Laser Engravers Guide publishes a new guide. No spam, no sharing your address, and you can unsubscribe in one click.

 E-mail address

New posts only · Unsubscribe anytime · [Privacy](https://laserengraversguide.com/privacy/)

Our #1 pick
 Sold as "80W": 10 W of optical output ![Creality Falcon A1 10W](https://laserengraversguide.com/_astro/creality-falcon-a1-10w.xF0nr-n8_ZAOBpI.webp)

### [Creality Falcon A1 10W](https://laserengraversguide.com/laser-engravers/creality-falcon-a1-10w/)
 7.9

- 10 W diode
- Enclosed
- 381 × 305 mm
Beginners who want a goggles-free enclosed laser with a big bed and a placement camera for under $600.
[Check price on Amazon](https://www.amazon.com/dp/B0DRVQNYQ1?tag=laserengraversguide.com-20)[Read the full review](https://laserengraversguide.com/laser-engravers/creality-falcon-a1-10w/)

[🎯 Not sure which fits? Match a laser to your materials, space and budget in 30 seconds.](https://laserengraversguide.com/tools/laser-matcher/)[🧪 Can it cut that? Check any material against diode, CO2 and fiber lasers.](https://laserengraversguide.com/tools/material-checker/)

## Keep reading
[Buying guide
### How to Choose a Laser Engraver: Type, Format, Power, Size and Software
A step-by-step way to choose a laser engraver: pick the laser type for your materials, then the format, real optical power, work area, software and the extras.
 Updated Oct 30, 2026](https://laserengraversguide.com/posts/how-to-choose-a-laser-engraver/)[Laser types
### Diode vs CO2 vs Fiber Laser: Which Type Do You Actually Need?
Diode vs CO2 vs fiber lasers explained: how wavelength decides what each cuts and marks, plus speed, upkeep, cost and safety, plus our picks of each type.
 Updated Oct 30, 2026](https://laserengraversguide.com/posts/diode-vs-co2-vs-fiber-laser/)[Head-to-head
### Creality Falcon A1 vs Falcon A1 Pro: Is the 20 W Upgrade Worth It?
Creality Falcon A1 vs A1 Pro: 10 W vs 20 W enclosed diode lasers. Bed size, cutting, autofocus, Wi-Fi, IR metal marking, real prices and which one is worth it.
 Updated Oct 30, 2026](https://laserengraversguide.com/posts/creality-falcon-a1-vs-falcon-a1-pro/)

 Sold as "80W": 10 W of optical output Falcon A1 10W $$$$ Mid-range Price tier: Mid-range
[Check price](https://www.amazon.com/dp/B0DRVQNYQ1?tag=laserengraversguide.com-20)