Cyanophage PP is distributed widely in freshwater and may play an important role in freshwater microbial loops. Solar ultraviolet radiation is one of the main factors causing cyanophage decay. Photoreactivation and dark repair are the two mechanisms of viral reactivation. This study examined Weigle reactivation of cyanophage PP under both red and white light. The results indicated that: (1) Weigle reactivation of cyanophage PP could be induced under both red and white light; (2) post-irradiation incubation of the host under both white and red light led to a decrease in the Weigle reactivation level, and the half-life of Weigle reactivation did not differ between the two post-irradiation incubation conditions; and (3) Weigle reactivation resulted in significantly higher viral survival increases under white light compared to red light—further work is needed to explain this phenomenon.