Removed in LÖVE 0.9.0  
 It has been renamed to ParticleSystem:setEmitterLifetime. 
Sets how long the particle system should emit particles (if -1 then it emits particles forever).
ParticleSystem:setLifetime( life )
number lifeNothing.
 
    © 2006–2016 LÖVE Development Team
Licensed under the GNU Free Documentation License, Version 1.3.
    https://love2d.org/wiki/ParticleSystem:setLifetime