The Lighting Mode determines the behavior of all Mixed Lights in all Scenes that use the Lighting Settings Asset. The available modes are:
Baked Indirect combines real-time direct lighting with baked indirect lighting. It provides real-time shadows. This Lighting Mode offers realistic lighting and reasonable shadow fidelity, and is suitable for mid-range hardware.
Shadowmask combines real-time direct lighting with baked indirect lighting. It enables baked shadows for distant GameObjects, and blends them automatically with real-time shadows. It is the most realistic, but also the most resource-intensive Lighting Mode. You can use Quality Settings to configure its performance and visual fidelity. This Lighting Mode is suitable for high-end or mid-range hardware.
Subtractive provides baked direct and indirect lighting. It renders direct real-time shadows for one Directional Light only. This Lighting Mode doesn’t provide particularly realistic lighting results, and is suitable for stylized art or low-end hardware.