A surgical lighting system includes a control device operable to adjust a color temperature of the surgical lamp, a camera, an image processing device, and means for transmitting color temperature information, corresponding to a set color temperature of the surgical lamp, to the image processing device. A fluid chamber 2 into which viscous fluid is charged is formed in a casing 1. The method concludes by performing a settlement of the futures contract based at least in part upon the purchase price and a value associated with the entertainment event at the settlement date.