# Source Length Switching

**URL:** <https://forums.unrealengine.com/t/source-length-switching/311821>\
**Category:** Blueprint\
**Tags:** source, unreal-engine, UE4, Blueprint, question\
**Created:** [March 20, 2015, 5:16am UTC](https://forums.unrealengine.com/t/source-length-switching/311821 "2015-03-20T05:16:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Demeese](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Demeese](https://forums.unrealengine.com/u/Demeese)\
**Post date:** [March 20, 2015, 5:16am UTC](https://forums.unrealengine.com/t/source-length-switching/311821/1 "2015-03-20T05:16:25Z")

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![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/b/8/4/b846936dcaac1a4f2c227dab0dd7332555f8c20e.png)

Here, the source length on point lights is displaying fine.

After I add a projectile or other object, the source length switches.

 ![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/0/a/2/0a2c73c1205b50f28d698a2bdbb3756757ba9e55.png)

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**Author:** ![Aphexx100](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Aphexx100](https://forums.unrealengine.com/u/Aphexx100)\
**Post date:** [November 29, 2016, 9:09pm UTC](https://forums.unrealengine.com/t/source-length-switching/311821/2 "2016-11-29T21:09:54Z")

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i also have this bug in our engine. it is very annoying  
is there a fix yet for source light switching?

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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:** [November 30, 2016, 6:55pm UTC](https://forums.unrealengine.com/t/source-length-switching/311821/3 "2016-11-30T18:55:33Z")

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It is currently a known issue: [Unreal Engine Issues and Bug Tracker (UE-26956)](https://issues.unrealengine.com/issue/UE-26956)

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**Author:** ![Aphexx100](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Aphexx100](https://forums.unrealengine.com/u/Aphexx100)\
**Post date:** [November 30, 2016, 7:16pm UTC](https://forums.unrealengine.com/t/source-length-switching/311821/4 "2016-11-30T19:16:25Z")

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thank you for clarification, tim!