Blue light therapy is one of the most common and effective treatments for neonatal jaundice, mainly targeting jaundice due to elevated indirect bilirubin. The principal mechanism of phototherapy involves transforming bilirubin into isomers, turning it from lipid-soluble to water-soluble, which can then be excreted through bile and urine without liver synthesis. Generally, the need for light therapy indicates a severe level of jaundice, but it is important to ascertain the type of bilirubin elevation before starting treatment. If the elevation involves conjugated bilirubin, light therapy will not be effective. Thus, if light therapy is necessary, it should be confirmed that the liver function issue involves elevated indirect bilirubin, in which case the effects of phototherapy are usually positive. The duration of treatment typically depends on the degree of jaundice and whether there are any complicating pathological factors. The method usually involves intermittent light exposure, generally spanning six to twelve hours. If the jaundice is more severe, continuous phototherapy lasting twenty-four to forty-eight hours might be required to reduce the bilirubin levels.