A power supply block is configured to provide a power supply path from at least one power source to an associated system. Adjustable lenses or optical systems may be used to provide adaptive vision modification. The beams run between the posts and a cable entry slot runs the length of each beam to allow cable entry at any point along the beam. At least one of the blades in a first section of the apex region has a weld connection to the second shroud, and in at least one second section of the apex region is free of a weld connection.