IC-Light V2-Vary is a lighting editing tool based on diffusion models, primarily addressing image generation and editing in complex lighting scenarios. It offers features like lighting consistency constraints, large-scale data support, and precise lighting editing. By ensuring that object appearances under different lighting conditions can be linearly combined through the theory of physical light transfer, it reduces image artifacts and maintains output consistency with actual physical lighting conditions. It is suitable for photographers, designers, and 3D modeling professionals, providing more possibilities for artistic creators.