Portable phototherapy units typically utilize either blue LED lights or fluorescent lamps to emit light in the blue-green spectrum, which is most effective for breaking down bilirubin. The baby is placed under the light source, often in an incubator or a bassinet, for a prescribed duration, depending on the severity of the jaundice. The light penetrates the skin and converts bilirubin into a more water-soluble form that can be excreted in the urine and stool.
