Head Light blueprint location, in Raft. 🙂 (Version 1.08)
1. Go to the Radio Tower.
2. Once you have found the Radio Tower, enter the tower on the surface level.
3. Climb the tower by using trash cans, lockers, and other objects that can be used to climb onto the second level of the tower.
4. On the second floor, in the C1 building, you will find the head light blueprint.