This review is devoted to the problem of the development of “lampenflora” - phototrophic fouling communities in karst caves’ areas with artificial lighting used for tourism purposes. The experience of domestic and foreign colleagues helps to understand the causes of its occurrence, the conditions for the formation and development of communities; describes the mechanisms of adaptation of individual species and communities to the complex conditions of underground ecosystems. Lampenflora is not typical for the cave environment, and in this regard, the adverse consequences of its presence are found in the form of an impact on the local biota and abiotic parameters of the environment. The review compares lampenflora and natural communities of phototrophs in the entrance zones of caves illuminated by sunlight.