A spectral imaging apparatus includes an image sensor positioned to capture images of a target, a rotating color wheel aligned with the image sensor, and a projector positioned to project overlay images onto the target. The system includes an application server which includes a site which is able to be enabled, and an authentication server, which is able to enable the application server site. The impact of the blades with the ice in a velocity range 150-300 Kmh produces artificial snow, with characteristics very similar to natural snow, suitable for ski-fields or other applications for snow. The file records may be replicated to respective databases at each of the destination data centers, and each respective destination data center may pull a copy of the file to the respective destination data center. The electrical connector thus constructed is superior in resistance to vibration, and achieves space-saving and a reduced overall height less than 5 mm and further the floating of the insulator. A first device is selected from a list of devices to add to the circuit.