“…Irradiation with fluorescent white light in vivo was shown to break bilirubin down into water-soluble products which can be elimi nated with bile and urine [2], Phototherapy has only been associated with minor side effects, like bronze skin, 1 Preliminary results were presented at the Interna tional Symposium on New Trends in Phototherapy held in Galzignano. Padova, June 9 -1 1, 1983. diarrhea, fever and skin rashes [3], However, several reports have appeared showing var ious aspects of bilirubin-sensitized photo damage [4]. In particular, it has been shown that erythrocytes can be hemolized by visible light in the presence of bilirubin [5], Maurer et al [6] showed that the rate of platelet turn over was significantly increased in the course of phototherapy.…”