Blue light therapy

Blue light therapy is primarily used for the treatment or prevention of neonatal jaundice (icterus neonatorum). It is sometimes – incorrectly – referred to as "UVA1 cold-light phototherapy". However, the radiation used is not UV-A but rather visible light with wavelengths of approx. 430–490 nanometres – that is, blue light.

Causes of neonatal jaundice

The red blood cells in newborns have a reduced lifespan, increasing the number of molecules of haemoglobin (the pigment in blood) that must be broken down. In many cases, this is more than the child's liver can process at this stage of development. As a result, bilirubin – a water-insoluble product of the breakdown of haemoglobin – accumulates in the skin and mucous membranes, causing a yellowish colouring.

Effects of blue light

Blue light triggers a photochemical process whereby the water-insoluble bilirubin is converted into a water-soluble form. This water-soluble bilirubin can then be transported away and excreted.

Light sources

Blue light therapy is delivered using fluorescent lamps, halogen lamps or LEDs with a high proportion of blue light. During treatment, the babies’ eyes are protected from exposure to excess light using a blindfold, for example. The treatment distance stipulated by the lamp manufacturer must be adhered to in order to ensure the correct dosage.

Light therapy for skin conditions

The use of blue light, as well as light of other wavelengths, is also being discussed as a treatment option for some skin conditions, such as neurodermatitis, psoriasis and acne.