Objective: Perform a literature review on the behavior of harmonics a cause of LED lighting. Method: Raise an in-depth research on Bibliographic Indexes (IB) and Bibliographic Bases with Selection Committee (BBCS) on Harmonics in LED lighting. The following article presents the electric behavior of LED illumination focused on harmonic distortion, analyzing topics such as harmonic generation, harmonics standards, harmonic solving, among others; each topic mentioned is accompanied by its respective citation to guarantee the copyright and give the reader a dynamic movement between what is stated in this work and the works cited. Results: A thorough investigation was carried out in detail, focusing on the harmonics in LED lighting, analyzing its current state and consequences with respect to other conventional luminaires and the energy system.