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It's interesting to recognize the differences in how film sensitivities, lighting and camera movement in early noir films helped create the genre and how those new films, processes and new lighting instruments joined in shaping and refining the look of noir films. Most early films that used artificial light relied on carbon arc lamps, the first commonly used lamps for street illumination before the development of incandescent lights After they were abandoned for common purposes, they continued to be used for specialized needs such as in movie projectors and searchlights. In film, the abandonment of carbon arcs and the development of Panchromatic film stocks - film stocks that were sensitve to a wider spectrum of color - freed directors and cinematographers from mostly stationary camera positions that 'staged' the action in a less visually dynamic ways and made the camera - and especially camera movement, on dollies and cranes an active participant in defining action and character and allowed for a new spatial and temporal depth in all film styles. Generally early films were visulally unexciting in terms of dynamic camera motion but together with faster Panchromatic film stocks, incandecent lights and new ways to change picture framing through movement-the camera was to bring a new dimension to the narrative.