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  3. 星和電機
  4. Japan's first! Developed and delivered a new tunnel LED lighting system using direct current power supply.
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  • Apr 15, 2019
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Apr 15, 2019

Japan's first! Developed and delivered 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 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 for the Enoura Tunnel, which is under the direct jurisdiction of 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, features a power supply unit installed inside 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 reduction in size and significantly easing 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 (downhill L=1,704m) on National Route 185, under the jurisdiction of the Hiroshima National Route Office of the Chugoku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism.
Ministry of Land, Infrastructure, Transport and Tourism, Chugoku Regional Development Bureau, Hiroshima National Route Office, National Route 185 Kiyama Tunnel (Downward L=1,704m)
Ministry of Land, Infrastructure, Transport and Tourism, Chugoku Regional Development Bureau, Hiroshima National Route Office, National Route 185 Kiyama Tunnel (Downward L=1,704m)
LED tunnel lighting fixture
LED tunnel lighting fixture
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●DC方式トンネル照明システム.pdf[204818]

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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 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.
Seiwa Electric Co., Ltd.
Homepage of Seiwa Electric Co., Ltd.

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Sign lighting using tunnel lighting fixtures, the first of its kind in the country.

We have delivered sign lighting using tunnel lighting fixtures, the first of their kind in Japan, to the Shin-Meishin Expressway (from Takatsuki JCT/IC to Kobe JCT).

Sign lighting refers to tunnel lighting that shines white. In the event of a vehicle fire, it flashes red, and in the case of accidents, falling objects, or breakdowns, it flashes yellow to alert drivers. This allows drivers to drive their vehicles with peace of mind.

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The first domestic pacemaker light using tunnel lighting fixtures.

We have delivered pace maker lights using tunnel lighting fixtures, the first of their kind in Japan, to the Shin-Meishin Expressway (from Takatsuki JCT/IC to Kobe JCT).

The Pace Maker Light is a tunnel lighting system that shines white and has green lights that illuminate in the direction of travel, creating a flow of light that drivers instinctively try to catch up with, helping to restore speed and alleviate traffic congestion. Conversely, when drivers exceed the green light, the Pace Maker Light employs technology to assist in speed regulation.

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星和電機
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Fukuda's leak test, leak inspection, leak detection, leak test, integrity test.

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Fukuda Co., Ltd. has been pursuing leak detection for 60 years and is committed to advancing the future of leak testing. 【 Supporting Various Leak Tests: Air Leak Test / Gas Leak Test (Hydrogen Gas, Helium Gas) 】 We develop, manufacture, and sell leak testing equipment to inspect airtightness and sealing properties. We will propose the appropriate testers and devices for each inspection target. 【 Target Industries and Examples of Inspection Targets 】 - Automotive Industry: Engines, FC components, valves and piping, various parts - Electronic Components Industry: Smartphones, keyless switches, various small sensors - Pharmaceuticals / Food / Cosmetics Industry: Bottle containers, syringes, vials, eye drop containers, pillow packaging, PTP packaging We will propose the most suitable leak testers for each industry. 【 ISO Certification 】JIS Q 9001:2015 (ISO 9001:2015)

Jan 23, 2026

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[Opening on January 6, 2026] New service launched to search for exhibits nationwide.

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We have launched a "Display Item Search Page" that allows you to search for unit houses currently on display at exhibition halls nationwide, which was made available on January 6, 2026. There are over 800 items listed on the website. You can filter by area, price range, size, purpose, product type, color, and more. You can also check exterior and interior photos, prices, facilities, and drawings/specifications online. If you're interested in a display item, you can directly inquire, make a reservation to visit, or consult via LINE. This is a convenient service that allows you to efficiently progress from comparison to detailed consideration. Please take a look!

Jan 23, 2026

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Publication of a paper in Oxford Open Materials Science

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A co-authored paper by Shin Otsuki from the Data Science Department and another author has been published in Oxford Open Materials Science. 【Paper Summary】 Title: The Exploration of Enhanced Methods in Data Science and Applications in Materials Science Authors: Raymond Wu, Shin Otsuki

Jan 23, 2026

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[New Product] Announcement of the High Brightness LED Lighting Box LLBLM-A Series

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"With high-precision dimming settings of 256/1000 gradations, you can achieve your desired results." The new 1-channel dedicated model LLBLM-A maximizes the performance of high-brightness LEDs. It offers high light stability through constant current control and flexibly accommodates a wide range of inspection and lighting applications with three types of interfaces: parallel, RS232C, and LAN. In addition to intuitive operation via the front panel, it supports high-precision dimming with 256/1000 gradations (256 gradations in parallel mode). The available emission colors are G (green) and B (blue). This new model balances stable light output with ease of use. For more details, please feel free to contact us.

Jan 23, 2026

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All participants chant for safety.

The Winter Safety Conference for the 7th year of Reiwa was held.

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Last month, we held a winter safety conference organized by our company. We have compiled the details and atmosphere of the day, as well as information on winter labor accidents, into a PDF. We would appreciate it if you could take a moment to read it.

Jan 23, 2026

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  • 10個まで5日で出荷 ロータリーエンコーダ 9,500円~16,600円(税別) Φ30、Φ40mm 100~4000P/R 磁気式インクリメンタル形
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