[Urgent] Slow beam effect

Hello,

I need to have a beam with slow undulations. It seems like all I am able to get, no matter what settings I tweak, is a fast rapid beam. How can I achieve a slow beam effect?

I have the exact same problem I can’t get it to slow it down … I want more an slow ambient noise than a jerky noise. I’ve look at some answer and does nothing as well

Oh and the funny thing I can get it to be way slower in UDK …

Just tried beam particle. I think something is dead wrong with the noise. Did anyone actually managed to get the noise to slow down properly ?