# Lumen no longer working in UE5.5 DX11 SM5

**URL:** <https://forums.unrealengine.com/t/lumen-no-longer-working-in-ue5-5-dx11-sm5/2126402>\
**Category:** Rendering\
**Tags:** dx11, unreal-engine, Lumen\
**Created:** [November 16, 2024, 12:43am UTC](https://forums.unrealengine.com/t/lumen-no-longer-working-in-ue5-5-dx11-sm5/2126402 "2024-11-16T00:43:37Z")\
**Posts on this page:** 1\
**Showing post:** 4

<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:** [November 16, 2024, 1:29am UTC](https://forums.unrealengine.com/t/lumen-no-longer-working-in-ue5-5-dx11-sm5/2126402/4 "2024-11-16T01:29:35Z")

</div>

5.5 release notes even mention SM5 Lumen support.

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/e/f/1ef03d4f7608a2b7534da2dfcfd68f6f6d55b91e.png)

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/4/a/74a75b96c067d9eb13bc2c8001fa1c4bc0d819a8.png)

> [@jblackwell](#):
>
> Both DX11 and SM5 for lumen were deprecated, a while ago I think- I don’t think they’ll be coming back; although frankly, your perf numbers are something remarkable.

Nah we have it running on APUs and really cheap non HWRT pixel streaming machines from 5.1 - 5.4

its literally the way to get performant GI in UE5 (GTX 1070 my guy … not even RTX)  
I track source changes and I’m almost for certain the Fortnite and UEFN DX12 requirement likely got pushed into UE5.5 main and it was an unintended side affect.

Wouldn’t be the first time I’ve seen this.

---

_[View the full topic](https://forums.unrealengine.com/t/lumen-no-longer-working-in-ue5-5-dx11-sm5/2126402)._