# How come some materials darken after light building?

**URL:** <https://forums.unrealengine.com/t/how-come-some-materials-darken-after-light-building/482581>\
**Category:** Rendering\
**Tags:** dark, light, unreal-engine, lighting-problem, question\
**Created:** [May 5, 2021, 6:18pm UTC](https://forums.unrealengine.com/t/how-come-some-materials-darken-after-light-building/482581 "2021-05-05T18:18:11Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![theross15](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@theross15](https://forums.unrealengine.com/u/theross15)\
**Post date:** [May 5, 2021, 6:18pm UTC](https://forums.unrealengine.com/t/how-come-some-materials-darken-after-light-building/482581/1 "2021-05-05T18:18:11Z")

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Hello to everyone, I have a particular problem.  
After I built the light in my scene I noticed some issue with some materials that were supposed to be (for example) white but they are in a dark grey tone.  
Later on, I built the light again from 10 to 80 indirect light bounces and it solved the problem.  
But then I had to rebuld the scene another time and I did with the same parameters and the problem came back again.  
All normals and uvs are ok. I have a feeling that it has something to do with the HDRI Backdrop and its Skylight.  
Thanking in advance for anyone who answer!

 ![337353-probl2.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/0/1/c01b80622b4f975dbbb72bcebe2f7dac77319464.jpeg)