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

星和電機

星和電機

Hoshi and Electric Co., Ltd. has been supplying lighting fixtures for numerous roads and tunnels since 1957, when it provided lighting for the Kanmon Tunnel, the world's first underwater tunnel at that time. In 2010, it supplied Japan's first LED tunnel lighting fixtures for the Enoura Tunnel, which is the first LED tunnel lighting for national highways directly managed by the Ministry of Land, Infrastructure, Transport and Tourism, continuously leading tunnel lighting in Japan. The newly developed tunnel LED lighting system, the first of its kind in Japan, achieves miniaturization and weight reduction by installing the power supply unit inside the electrical room and supplying power to the lighting fixtures in the tunnel with direct current. While conventional products had the power supply unit within the fixture itself, this product allows for miniaturization since the power supply unit is not inside the fixture, significantly reducing installation work. Additionally, by consolidating the power supply unit in the electrical room rather than inside the fixture, maintenance has been simplified. The direct current-powered tunnel LED lighting adopts both the technology registered in the Ministry of Land, Infrastructure, Transport and Tourism's New Technology Information System (NETIS) (CG-170008) and the technology for compact and lightweight LED tunnel lighting fixtures (TH-150008).

LED tunnel lighting fixtures using direct current power supply method.
Ministry of Land, Infrastructure, Transport and Tourism, Chugoku Regional Development Bureau, Hiroshima National Route Office, National Route 185 Kyoyama Tunnel (Downward L=1,704m)

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Japan's First! Development and Release of a New Tunnel LED Lighting System Using Direct Current Power Supply
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 as it does not have a power supply unit within the fixture, significantly reducing installation work. Additionally, by collectively installing the power supply unit in the electrical room instead of inside the fixture, maintenance has been simplified.
Seiwa Electric Co., Ltd.
Homepage of Seiwa Electric Co., Ltd.

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