Well, Rembrandt employed light to create contrast and depth. This helped to emphasize emotions and important elements within the story. For instance, he might use a bright light on a character's face to show their significance or a soft glow to set a mood.
Rembrandt's use of light is masterful. He would use it to cast shadows and illuminate specific areas to guide the viewer's eye and reveal the narrative. Sometimes, the way he used light could even suggest hidden meanings or subtexts in the story.