Methods for securing wood members together are disclosed. The output light of the first integrating sphere is spatially divided to provide a plurality of divided lights and the plurality of divided lights are supplied to a plurality of second integrating spheres respectively, each second integrating sphere having an input port that receives a divided light and an output port providing an output light. The transfer device is adapted to move the glass substrate between the processing device and the storage shelf and between the storage shelf and the transporting device.