Aspects of the present disclosure include systems for irradiating particles in a flow stream. Systems according to certain embodiments include a light source having a first laser configured for continuous irradiation of a flow stream and a second laser configured for irradiation of the flow stream in discrete intervals where each discrete interval of irradiation by the second laser is triggered by irradiation of a particle in the flow stream with the first laser. Methods for irradiating a sample in a flow stream with the subject light sources are also described. Computer readable storage medium for practicing the subject methods are provided. Kits having one or more lasers are also provided.