Photo therapy involves exposer of the skin of the jaundiced to blue or cool white lighth of wavelength 400-520nm.
Detoxification begins immediately by the production of configuration and structural photo-isomers of
bilirubin in the skin and precedes the fall in serum bilirubin.
Special lamps emitting light predominantly in those wavelengths are considered to be the most effective and specific
for administering photo therapy.
Light is effective in the treatment of hyperbilirubinemia mainly the infant’s skin because its blue content Is low. Besides, hyperpyrexia and skin
burns may occur due to prolonged sunlight exposer.