There are currently only arbitrary scales or codes for reflected light in use by photographers. There is no universal or international standard used as a primary benchmark for photographers. The Black Cat Guide establishes the UNIVERSAL LIGHT CODE (ULC). A simple code for photographic notation consisting of twenty six "file folders" that contain the full range of light that can be seen by the human eye. The exposure dial acts as a "decoder" and translates the scene into exposure settings. For example: a full moon (man-in-the-moon) is CODE C and lightning is CODE K. Anyone armed with the UNIVERSAL LIGHT CODE for a scene has the knowledge that currently belongs to the professional.