A large-area protective covering system for installation in a staggered or grid configuration is provided comprised of a plurality of essentially identical large-area panels with honeycomb internal structures which have locking systems on the sides and ends for locking the panels in place. The method may further include accessing an information graph that contains nodes and edges connecting the nodes. The glass blank is blackened and the aperture step portion is removed creating a desired transmissive aperture through the glass blank. In another set of embodiments, the present invention provides projection systems having digital lighting processing engines illuminated by blue andor green laser devices. The first inductor and the second inductor are symmetrical to each other and jointly surround an adjustable area for varying an inductance of the variable inductor.