# Problem with lights building

**URL:** <https://forums.unrealengine.com/t/problem-with-lights-building/331713>\
**Category:** Rendering\
**Tags:** unreal-engine, crash, bug-report, Lighting, UE4, question\
**Created:** [September 10, 2015, 1:59pm UTC](https://forums.unrealengine.com/t/problem-with-lights-building/331713 "2015-09-10T13:59:58Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![Jacky](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jacky/32/918690_2.png) [@Jacky](https://forums.unrealengine.com/u/Jacky)\
**Post date:** [September 10, 2015, 3:20pm UTC](https://forums.unrealengine.com/t/problem-with-lights-building/331713/7 "2015-09-10T15:20:41Z")

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With dynamic lighting(movable lights) you dont have to build at all. With static lighting you should build when your level is ready, not every time you place an object. Check out this document for more info:

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