# Stationary lights with source length flicker **URL:** \ **Category:** Rendering\ **Tags:** source, stationary-lights, unreal-engine, lighting-problem, Lighting, question\ **Created:** [September 6, 2018, 11:36am UTC](https://forums.unrealengine.com/t/stationary-lights-with-source-length-flicker/433296 "2018-09-06T11:36:32Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Not\_A\_Company](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Not\_A\_Company](https://forums.unrealengine.com/u/Not_A_Company)\ **Post date:** [September 6, 2018, 11:36am UTC](https://forums.unrealengine.com/t/stationary-lights-with-source-length-flicker/433296/1 "2018-09-06T11:36:32Z")
Hello there, As you can see [**here**](https://gfycat.com/MealyAdvancedChafer), depending on the angle the camera is in, the source length of the stationary lights seems to get set to 0 and back to the length it should be. They all change together, at the same time, for the entire level. I have this problem since 4.17 and never found a solution to this. Thanks in advance! ---
**Author:** ![anonymous\_user\_eec879e41](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_eec879e41](https://forums.unrealengine.com/u/anonymous_user_eec879e41)\ **Post date:** [September 6, 2018, 11:44am UTC](https://forums.unrealengine.com/t/stationary-lights-with-source-length-flicker/433296/2 "2018-09-06T11:44:23Z")
I’ve also had issues with long stationary lights - they caused very obvious white dots to appear at the seams between static meshes. Never seen your issue though… Have you tried replicating this issue in an empty project? ---
**Author:** ![Not\_A\_Company](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Not\_A\_Company](https://forums.unrealengine.com/u/Not_A_Company)\ **Post date:** [September 6, 2018, 12:24pm UTC](https://forums.unrealengine.com/t/stationary-lights-with-source-length-flicker/433296/3 "2018-09-06T12:24:31Z")
Trying to replicate it as we speak, but I cannot seem to. I must say my current project is quite large… This entry would seem to be the same kind of issue: [https://answers.unrealengine.com/questions/412005/point-light-source-length-doesnt-work-with-tiledde.html?sort=oldest](https://answers.unrealengine.com/questions/412005/point-light-source-length-doesnt-work-with-tiledde.html?sort=oldest) Unresolved since Feb 2016… ---
**Author:** ![Not\_A\_Company](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Not\_A\_Company](https://forums.unrealengine.com/u/Not_A_Company)\ **Post date:** [September 6, 2018, 12:31pm UTC](https://forums.unrealengine.com/t/stationary-lights-with-source-length-flicker/433296/4 "2018-09-06T12:31:21Z")
Ok, I have been able to replicate it in an empty project! If you have \>80 point lights on stationary in your screen, it switches to 0 source length. ---
**Author:** ![Not\_A\_Company](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Not\_A\_Company](https://forums.unrealengine.com/u/Not_A_Company)\ **Post date:** [September 6, 2018, 1:01pm UTC](https://forums.unrealengine.com/t/stationary-lights-with-source-length-flicker/433296/5 "2018-09-06T13:01:46Z")
Manually setting the TiledDeferredShading minimum count to a higher amount fixes the problem, at least while you are in the editor. Default value is 80. To set it higher, you can enter a console command, for example: r.TiledDeferredShading.MinimumCount 200 I haven’t found a way to set it in an .ini file or something, so it retains that value after you build the project… ---
**Author:** ![Not\_A\_Company](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Not\_A\_Company](https://forums.unrealengine.com/u/Not_A_Company)\ **Post date:** [September 6, 2018, 1:39pm UTC](https://forums.unrealengine.com/t/stationary-lights-with-source-length-flicker/433296/6 "2018-09-06T13:39:39Z")
Adding this console command to the Event BeginPlay in your level blueprint does the trick. Not really a solution, more of a hack. Increase/decrease the minimumcount to your liking. (Default = 80) ![252943-capt2.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/6/9/0/690bbf1ff27b7e11bd83f7ae03ac340ce9671e02.png)