A system and method of managing casino patron money balances which stores patron money balances in electronic form. The ohmic electrode structure is provided with a first metal film formed on the nitride semiconductor and a second metal film formed on the first metal film. The second compartment electrically and mechanically connected to a top surface of a second die. The controller receives a signal indicative of the state of the monitored power characteristics, and temporarily interrupts the power to the lamp when the signal indicates that the power source is currently failing to maintain a stable current flow through the lamp. Also, a method is disclosed that uses a high-speed one-dimensional light includes controlling a scanner in an optical engine system. The plurality of relay devices create communication quality information in radio communication between the relay devices and the radio base station.