Open and enclosed arc lights for street lighting were soon widely superceded by incandescent lights soon after 1912. About that year a major advancement in tungsten filament technology quickly made these "new" lightbulbs far more energy efficient and much less costly to maintain than the carbon arc lights that formerly lit America's downtowns. Further, these advanced lamps (in smaller sizes) became standard in regular older incancescent street light fixtures (like the gooseneck ones I have posted in this album) replacing their less efficient carbon filament predecessors. Many carbon arc fixtures were converted to incandescent ones via "kits" by GE and others in the teens and thereafter. The suspension style fixture shown has a "then-new" porcelain body and radial-wave reflector, altogether replacing the arc light that preceeded it. But the span wire and electric supply wires to the fixture likely were likely unchanged.