Particle domino effect how to

I have a cylindrical room with 16 torches  when my characters and reaches the middle of the room the torches should light up either one by one or two by two left-right pattern arround the room what is the best way to acheive this.

ps I dont think it's important but I'm using pre .9 jme

This isn't really an effect question but more of a timing question.  You should be able to precreate your torch flames and simply write your own controller that either adds them to the scene or disables culling on the flames as time increases.

thanks I'll try it