Japan's first! Developed and delivered a new tunnel LED lighting system using direct current power supply.

Hoshi and Electric Co., Ltd. has been supplying lighting fixtures for numerous roads and tunnels since 1957, when it delivered lighting fixtures for the Kanmon Tunnel, the world's first underwater tunnel at that time. In 2010, it supplied Japan's first LED tunnel lighting fixtures to the Enoura Tunnel, which is under the direct jurisdiction of the Ministry of Land, Infrastructure, Transport and Tourism, continuously leading the way in tunnel lighting in Japan.
The newly developed tunnel LED lighting system, the first of its kind in Japan, features a power supply unit installed in the electrical room, providing direct current to the lighting fixtures in the tunnel. This innovation allows for the miniaturization and lightweight design of the fixtures. While conventional products had the power supply unit within the fixture itself, this new product does not, enabling a more compact design and significantly reducing installation work. Additionally, by consolidating the power supply unit in the electrical room instead of within the fixture, maintenance has been simplified.
Recently, we have supplied the tunnel LED lighting system for the Kyuuzan Tunnel (downward L=1,704m) on National Route 185, under the jurisdiction of the Hiroshima Road Office of the Chugoku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism.


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The newly developed tunnel LED lighting system, the first of its kind in Japan, has achieved miniaturization and weight reduction of the lighting fixtures by installing the power supply unit inside the electrical room and supplying power to the fixtures in the tunnel with direct current. Conventional products had the power supply unit inside the fixture itself, but this product allows for miniaturization since there is no power supply unit inside the fixture, significantly reducing installation work. Additionally, by consolidating the power supply unit in the electrical room instead of inside the fixture, maintenance has been simplified.
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