Based on the provided search snippets, there is no specific information available regarding a "light fusion phase." The snippets mention various topics related to fusion, such as ultimate fusion with true light, fusion energy gain, projectile-based inertial fusion, and commercialization of fusion energy. However, there is no direct reference to a "light fusion phase" in the snippets https://bbgate.com/media/adb-pinaca-synthesis.93/.
It's important to note that the search results provided are limited, and there may be other sources or contexts where the term "light fusion phase" could be relevant. If you have any additional information or context about the term, please provide it, and I'll do my best to assist you further.