Unreal Engine 5 Lumen vs Ray Tracing: Which Is Better?

Unreal Engine recently unveiled Unreal Engine 5, which includes many great new innovative features, one of which is the lumen.

If you’re familiar with, or even if you’re not, lumen, we’ll answer all of your questions and compare lumen to the industry’s next big thing, Ray Tracing, in short, Lumen vs RTX.

So, if you’re curious about the lumen, what difference it can make, and why we’re comparing it to the RTX, keep reading until the end.

What is Lumen?

Unreal Engine 5 Lumen vs Ray Tracing

By the definition from unreal Engine, Lumen is the default global illumination and reflections system in Unreal Engine 5. It renders diffuse interreflection with infinite bounces and indirect specular reflections in large, detailed environments at scales ranging from millimeters to kilometers.

What is Ray Tracing?

Unreal Engine 5 Lumen vs Ray Tracing

Ray tracing, which has long been used for non-real-time rendering, provides realistic lighting by simulating the physical behavior of light. Ray tracing calculates the color of pixels by tracing the path that light would take if it were to travel from the eye of the viewer through the virtual 3D scene.

Lumen vs Ray Tracing

Hardware Requirement

Lumen has an advantage in terms of hardware requirements because it does not require the same level of light calculation as ray tracing. This means that lumen can render realistic light but does not require ray tracing.

Winner: Lumen


In terms of visuals, a direct answer is difficult to provide because the lumen has global illumination as well, but without the need for backing into the texture.

And on the other hand, RTX renders light on a realistic system, but that requires a pretty powerful GPU to pull that off.

But GPUs are also becoming much more powerful, so this means RTX does have a long-term future in gaming and lumen has the advantage of being much more smooth and pretty realistic without the need for powerful hardware.

Winner: RTX with little margin


RTX and Lumen are both great technologies. RTX has been used for rendering non-realtime for a long time and, in very recent years, RTX has come to gaming, so there is still a lot of progress to make with RTX in gaming. 

The Lumen is also a relatively new light technology, but it has several advantages. 

For example, a lumen will be included in the Unreal Engine 5, which means that many future games that use UE 5 will have the option to use a lumen because it does not require a specific GPU to achieve realistic global illumination and, as a result, a lumen is not a resource-hungry illumination system. 

But also, RTX is going nowhere here. We will still have many RTX games now, and in the future, but having more than one option for realistic global illumination for video games is a huge thing for gamers and developers.

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