[Home](./index.md) > [server](./server.md) > [ParticleEmitterOptions](./server.particleemitteroptions.md) > [lifetimeVariance](./server.particleemitteroptions.lifetimevariance.md) ## ParticleEmitterOptions.lifetimeVariance property The lifetime variance of an emitted particle in seconds. **Signature:** ```typescript lifetimeVariance?: number; ```