Systems and methods for pulsing high intensity narrow spectrum light are provided. In one example embodiment, a lighting system includes can include one or more high intensity narrow spectrum light sources configured to emit high intensity narrow spectrum light. The lighting system can further include a power circuit configured to provide power to the one or more high intensity narrow spectrum light sources and a pulsing circuit configured to control delivery of power to the one or more high intensity narrow spectrum light sources so as to pulse the emission of high intensity narrow spectrum light from the one or more high intensity narrow spectrum light sources.