...
You can alter the life span to create a more random behaviour when particles are disappearing. “Variation” is quoted in seconds and accepts both negative and positive values. Be careful with very high settings, because they can create an unwanted flickering.
Split
Instead of deleting the particles you can also force the daemon to create more particles at a certain life value. The amount of split particles is specified under “# child”.
# child
Here you can define the number of child particles to be created if “Split” is set to “Yes”.