# random flicker from Single Blueprint

**URL:** <https://forums.unrealengine.com/t/random-flicker-from-single-blueprint/479357>\
**Category:** Rendering\
**Tags:** light, unreal-engine, flickering, question, Blueprint\
**Created:** [February 24, 2021, 6:47pm UTC](https://forums.unrealengine.com/t/random-flicker-from-single-blueprint/479357 "2021-02-24T18:47:16Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![jakebaker865](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@jakebaker865](https://forums.unrealengine.com/u/jakebaker865)\
**Post date:** [February 24, 2021, 6:47pm UTC](https://forums.unrealengine.com/t/random-flicker-from-single-blueprint/479357/1 "2021-02-24T18:47:16Z")

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Hi, I have a blueprint with a point light in it set up to cycle through a timeline to create a “constant flicker”. Problem is that when I put more than one in a single scene they play the timeline at the same time and pulse all the same. Can anyone tell me how to either do this better, or create a random flicker delay so they don’t all flicker at the same time?

 ![330773-2.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/0/4/2/0426d9013152ebb6afe1f0e0c1e17eef632087ba.png)

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**Author:** ![Everynone](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/everynone/32/1135017_2.png) [@Everynone](https://forums.unrealengine.com/u/Everynone)\
**Post date:** [February 24, 2021, 8:28pm UTC](https://forums.unrealengine.com/t/random-flicker-from-single-blueprint/479357/2 "2021-02-24T20:28:34Z")

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How about this snazzy Light Function?

## Material

 ![330777-lightf.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/f/e/2/fe2bd5e569feba928af0da2a87920eba0727166f.jpeg)

## Actor with a light

 ![330778-actorstrobe.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/6/b/b/6bbcb6bc6c204fa55b873fb526ce0d85f7c0317f.jpeg)

[![Image from Gyazo](https://d3kjluh73b9h9o.cloudfront.net/original/4X/9/3/e/93e30a9a9e9569e6cb840b00a87b0781e5eb8989.gif)](https://gyazo.com/6a6d9cc417dd5e6e8377c7bf2cba686a)

It’s nice this way because when bulbs flicker it’s not really a sharp off/on. It’s a quick falloff transition and this is simulated here; and quite efficiently, too.

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<div class="post-metadata">

**Author:** ![Everynone](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/everynone/32/1135017_2.png) [@Everynone](https://forums.unrealengine.com/u/Everynone)\
**Post date:** [February 24, 2021, 8:40pm UTC](https://forums.unrealengine.com/t/random-flicker-from-single-blueprint/479357/3 "2021-02-24T20:40:26Z")

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Also if you want to use your method, start the Timeline on Begin Play (Tick executes every frame, so that’s wasted performance) but add a random Delay before it starts.

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**Author:** ![jakebaker865](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@jakebaker865](https://forums.unrealengine.com/u/jakebaker865)\
**Post date:** [February 24, 2021, 9:11pm UTC](https://forums.unrealengine.com/t/random-flicker-from-single-blueprint/479357/4 "2021-02-24T21:11:36Z")

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I actually went with the second way you suggested. I do like the 1st way though. Maybe I can use it elsewhere in the project 🙂 Thanks!

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<div class="post-metadata">

**Author:** ![Everynone](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/everynone/32/1135017_2.png) [@Everynone](https://forums.unrealengine.com/u/Everynone)\
**Post date:** [February 24, 2021, 9:25pm UTC](https://forums.unrealengine.com/t/random-flicker-from-single-blueprint/479357/5 "2021-02-24T21:25:47Z")

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Timeline would be great if you wanted light to flicker in a very specific manner to building up to a jump scare in a horror game, for example.

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<div class="post-metadata">

**Author:** ![jakebaker865](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@jakebaker865](https://forums.unrealengine.com/u/jakebaker865)\
**Post date:** [February 24, 2021, 9:40pm UTC](https://forums.unrealengine.com/t/random-flicker-from-single-blueprint/479357/6 "2021-02-24T21:40:37Z")

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Noice! Thanks for the info!