Light-A-Video is an innovative video relighting technology designed to address lighting inconsistencies and flickering issues prevalent in traditional video relighting. By employing a Consistent Light Attention (CLA) module and a Progressive Light Fusion (PLF) strategy, it enhances lighting consistency across video frames while maintaining high-quality image results. Requiring no additional training, this technology can be directly applied to existing video content, offering both efficiency and practicality. It is suitable for video editing, film production, and other fields, significantly enhancing the visual appeal of videos.