if you are talking about a flickering light on your particle system, if you are using a GPU based particle system, then you could create a point light and toggle the visibility over and over again using blueprints, if you are using a standard Sprite particle system then when you create your light module on the Particle Emitter, turn the Spawn Fraction down until you get it to a good place that you want it until it looks good to you.
if you need any more help just ask.
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