bevy_light_2d is a Rust library providing 2D lighting functionality for the Bevy game engine. It implements point lights, spot lights, light occlusion (shadows), and ambient lighting through a multi-pass rendering system using signed distance fields (SDF) and ray marching. The architecture follows Bevy's ECS pattern with a plugin that integrates into the render graph, separating extraction, preparation, and rendering phases. The library demonstrates solid software engineering practices with clear separation of concerns and implements non-obvious graphics techniques for efficient shadow calculation.