A butt connection of divided hollow profile members, which is suitable in particular for rotor blades of wind power installations, comprises a multiplicity of straps which are arranged along the join and which bridge over same and which are respectively fixed with their ends to one of the profile members to be connected. The method includes the process of calculating a rate of return index for an option series. The front frame is secured to both the first rear frame and the second rear frame. In another embodiment, a landscape waterfall includes a plastic extruded frame structure and a housing affixed to a front side of the extruded frame structure. A continuous wave pump light system is optically coupled to the fibers so as to store energy in the fibers for a subsequent amplification of the optical signal from the light source.