Disclosed is a medical apparatus for light therapy. The apparatus comprises a light-emitting apparatus (10) and a light-transmissive disposable device (16) capable attaches to the light emitting apparatus (10). The light-transmissive disposable device (16) allows light to transmit to a surface of a patient. The disposable device (16) also comprises a drug or chemical source in the form of a delivery layer. The disposable device is removed from the light-emitting apparatus (10) after use and replaced with a replacement light-transmissive disposable device (16).
