Japan's first! Development of a new tunnel LED lighting system using direct current power supply.
Technologies registered in the New Technology Information System (NETIS) have adopted both the direct current power supply method (CG-170008) and (TH-15008).
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 within the fixture itself, but this product does not have a power supply unit inside the fixture, allowing for miniaturization and significantly reducing installation work. Additionally, by consolidating the power supply unit in the electrical room, maintenance has been simplified. The direct current-powered tunnel LED lighting system makes the lighting fixtures ultra-compact and lightweight, reducing construction costs by using connector-type power wiring, and improving maintenance ease and safety by placing the power supply unit in the electrical room. The direct current-powered tunnel LED lighting incorporates technologies registered with 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). Recently, we supplied the tunnel LED lighting system for the Kyuuzan Tunnel (downhill L=1,704m) on National Route 185, under the jurisdiction of the Hiroshima National Highway Office of the Chugoku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism.
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basic information
Hoshi and Electric Co., Ltd. has been supplying lighting fixtures since 1957 (Showa 32), when it provided lighting for the Kanmon Tunnel, the world's first underwater tunnel at that time. In 2010 (Heisei 22), it supplied the first LED tunnel lighting fixtures in the country for a national highway directly managed by the Ministry of Land, Infrastructure, Transport and Tourism to the Enoura Tunnel. 1. The LED tunnel lighting fixtures with a direct current power supply system only consist of the LED (light-emitting part) without an internal power supply unit, resulting in an ultra-compact and lightweight housing, which reduces both fixture costs and installation costs compared to conventional products. 2. The dimming control of the tunnel lighting fixtures is possible through direct current control from the power supply unit in the electrical room, eliminating the need for dedicated dimming cables. 3. The power connection for the tunnel lighting fixtures uses waterproof connectors, which streamlines the wiring connection work and contributes to shortening the construction process. (Series connection method using CVV cable) 4. By installing the direct current power supply unit in the electrical room, maintenance for inspection and replacement is improved. 5. The tunnel lighting fixtures are designed without corrosion-prone components such as hinges and locks, enhancing fall prevention and safety. 6. The direct current power supply unit allows for remote monitoring via the web from a computer installed in an office or similar location through network connectivity, enabling remote maintenance and preventive maintenance, including fault monitoring.
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Applications/Examples of results
In March 2019, we adopted and delivered a tunnel LED lighting system for the Koyama Tunnel (downhill L=1,704m) on National Route 185, under the jurisdiction of the Hiroshima National Highway Office, Chugoku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism.
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Hoshia Electric has established itself as a top manufacturer in various fields, including information display systems such as road information boards, industrial lighting known for its waterproof and explosion-proof features under the name "Water Pearl," tunnel lighting that began with the full-scale installation in the Kanmon Tunnel, and resin products represented by "Cutting Duct." As a new business, we started an electromagnetic noise countermeasure (EMC) product business in 1997 to address electromagnetic noise issues arising from digital devices. In the LED business, we successfully developed a blue light-emitting diode in April 2002 and a white light-emitting diode in December of the same year. Based on these technologies, we are actively expanding our business in the field of LED lighting fixtures, ranging from roads and tunnels to industrial lighting. On March 9, 2018, Hoshia Electric Co., Ltd. was listed on the Tokyo Stock Exchange First Section. In April 2022, we transitioned to the Tokyo Stock Exchange Standard Market. Moving forward, we will continue to leverage our creative thinking and technological capabilities cultivated thus far to develop even more innovative products and strive for business expansion. Back to the roots of manufacturing "From the Kyoto to the world"