# Lumen GI and Reflections feedback thread

**URL:** <https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108>\
**Category:** Rendering\
**Tags:** Staff-Pick-UE, unreal-engine, Lumen\
**Created:** [February 22, 2022, 9:01pm UTC](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108 "2022-02-22T21:01:05Z")\
**Posts on this page:** 1\
**Showing post:** 2143

<div class="post-metadata">

**Author:** ![Uno1982](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/uno1982/32/982436_2.png) [@Uno1982](https://forums.unrealengine.com/u/Uno1982)\
**Post date:** [January 28, 2025, 7:34pm UTC](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108/2143 "2025-01-28T19:34:04Z")

</div>

> [@Lumen no longer working in UE5.5 DX11 SM5](https://forums.unrealengine.com/t/lumen-no-longer-working-in-ue5-5-dx11-sm5/2126402/13):
>
> Workaround for SWRT Lumen in SM5 cheaper than DX12 [[UE5.5.2 - Lumen no longer working in DX11 (SM5) [Workaround]] ](https://www.youtube.com/watch?v=bDRdO4k6fKY)

let me also state that while vulkan is faster than dx12 … it is by a very small margin as DX12 performance drastically improved with avg RHI cost dropping by an entire 2ms

---

_[View the full topic](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108)._