Active illumination is a process where an object is illuminated by an external source, such as a flashlight or a lamp. However, there are several other terms that can be used as synonyms for this phrase. One of these is active lighting, which refers to the use of artificial lighting to create a source of illumination. Another synonym is directed illumination, which highlights specific areas or objects to provide visual clarity. Active lighting is often used in photography, where it is used to highlight specific details or create a particular mood. Meanwhile, directed illumination is commonly used in forensic science to aid in the investigation of crime scenes. Overall, active illumination has many synonyms depending on the context in which it is used.