1. No flashlights are needed in japan, almost every square feet of land is city.
2. To produce flashlight they need an instalation and manufacturing plant, which is very expensive.
3. They have cellphones which doubles as flashlights.
4. There is almost none technology involved in flashlights, so a japanese made flashlight won't be adge cutting.
5. The same reason japan doesn't mass produce clothes, furnitures, low tech devices. The production cost in japan is super expensive, so they only produce things such as vehicles, some computer parts, electronics, batteries which envolves complex and high tech procedures in their making process.