Abstract: A hardening initiation lamp for illumination of a light-hardenable bandage, where the lamp is shaped so that it can at least partially enclose the bandage, the lamp including an inner side, which is substantially arranged to face inwards towards the bandage when the latter is illuminated, and an outer side, which is substantially arranged to face away from the bandage when the latter is illuminated, the lamp further including at least one hardening light source having means to initiate a hardening process in the bandage, and at least one illumination light source, which can emit light in the visible spectrum, arranged to illuminate the bandage at least while the hardening process is initiated in the bandage, both the hardening light source and the illumination light source being arranged to emit light from the inner side, substantially in the direction of the bandage, and the lamp further including one or more observation areas, wherein a light filter is arranged, which allows light from the illumination ligh