The volume starts with periodical reports of the recent literature on physical and inorganic aspects, including the molecules of colour, light induced reactions in cryogenic matrices, photobiological systems studied by time-resolved infrared spectroscopy, photophysics and photochemistry of transition metal complexes, recent advances in photocatalytic water splitting, and finally a chapter on time-resolved spectroscopy application of LFP to heterogeneous photocatalysis. Coverage continues in the second part with highlighted topics including, among others, transition metal complexes-based photochemotherapy, advances in polaritonic photochemistry, synthetic strategies based on halogen atom transfer processes and photochemical water oxidation using metal-based chromospheres. This volume will again include a third section entitled SPR Lectures on Photochemistry, providing examples introducing academic readers to a photochemistry topic and precious help for students in photochemistry.