A gaming system may include a number of gaming units and a host computer operatively coupled to the gaming units, and be configured to allow a gaming tournament to be conducted. A related system is also disclosed. The U-shaped channel of the housing and the circuit board are accommodated in a case so that the bag-shaped space faces down. The dosage and energy of each deep-array implant may be optimized so that the collection of signal carriers by the photosensitive region and the photoresponse for different wavelengths are maximized. The apparatus includes a tube for receiving a portion of a multi-spectral light source, and a mask coupled to the tube for blocking other portions of the light source.