# Sudden Lighting Changes?

**URL:** <https://forums.unrealengine.com/t/sudden-lighting-changes/303585>\
**Category:** Rendering\
**Tags:** quality, light, unreal-engine, Rendering, Lighting, question\
**Created:** [January 10, 2015, 11:30pm UTC](https://forums.unrealengine.com/t/sudden-lighting-changes/303585 "2015-01-10T23:30:11Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Dan0z0](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Dan0z0](https://forums.unrealengine.com/u/Dan0z0)\
**Post date:** [January 10, 2015, 11:30pm UTC](https://forums.unrealengine.com/t/sudden-lighting-changes/303585/1 "2015-01-10T23:30:11Z")

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Hi,  
I’ve been working on a scene for a little while (the lighter image) outlining the level. However suddenly the lighting has changed (darker image) and when played in game mode the view is blurring. The same effect has happened to another scene I was creating. This effect seems to has happened when I opened two scenes at once (possibly), I sometimes see a message saying my frame rate has drop and UE4 wants to reduce the quality. Could this be the issue? how can I reset the settings and revert back to the higher quality render?

Thanks for any help,

Dan.

 ![26281-graybox_02.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/b/5/f/b5f2fafe4592dea33450c921f98b94ffe0255977.jpeg)

 ![26282-graybox_01.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/8/0/c80da11e9b91ba658255d07f35fc6c78eb63c17e.jpeg)

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**Author:** ![Dan0z0](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Dan0z0](https://forums.unrealengine.com/u/Dan0z0)\
**Post date:** [January 10, 2015, 11:48pm UTC](https://forums.unrealengine.com/t/sudden-lighting-changes/303585/2 "2015-01-10T23:48:48Z")

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Also under closer inspection the scene does not contain any highlights from the roughness map after the sudden lighting and quality changes.

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**Author:** ![Tim\_Hobson](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Tim\_Hobson](https://forums.unrealengine.com/u/Tim_Hobson)\
**Post date:** [January 11, 2015, 6:00am UTC](https://forums.unrealengine.com/t/sudden-lighting-changes/303585/3 "2015-01-11T06:00:43Z")

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Hi Dan,

To set the quality settings back to the highest go to your Settings toolbar button \> Engine Scalability \> and set everything to Epic.

If this doesn’t solve your issue let me know and we can look at other things that may have caused the issue.

Tim

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**Author:** ![Dan0z0](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Dan0z0](https://forums.unrealengine.com/u/Dan0z0)\
**Post date:** [January 11, 2015, 9:03am UTC](https://forums.unrealengine.com/t/sudden-lighting-changes/303585/4 "2015-01-11T09:03:38Z")

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Yeah it worked. Thank you so much for your comment.

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**Author:** ![Rama](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/rama/32/882413_2.png) [@Rama](https://forums.unrealengine.com/u/Rama)\
**Post date:** [August 24, 2023, 12:04am UTC](https://forums.unrealengine.com/t/sudden-lighting-changes/303585/5 "2023-08-24T00:04:24Z")

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Thank You, Thank You, Thank You ❤ @Tim_Hobson ! ❤

You just saved me from the singularly most confusing moment,

Of My Entire Life…

Somehow, after a routine Windows Update, \<~~~

My Default UE5 Engine Scalability get set to low.

Lighting looked shallow…

GPU Particles all but disappeared… sniff…

My entire world… had ended… and no one told me… how it happened… sniff

❤ And then, I found this post!!! ❤

My Entire World, Restored, With One Click!

Thank You!

❤

Rama

PS:

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/6/f/16fdafd8c2b7d11f3a189dc5bdb9521796d2a9e5.jpeg)