The present invention relates to immunotherapeutic peptides and their use in immunotherapy, in particular the immunotherapy of cancer. An analog signal is converted to digital form to obtain a digital signal by increasing a conversion resolution value of an analog-to-digital converter module. The rotating scan lenses focus the scan beams into radiation spots and project them onto a scanned surface as moving scan spots. The LED lamp head includes one or more LEDs coupled to a printed circuit board and a lens to spread the light generated by the LEDs to provide a larger area of illumination.