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  1. Home
  2. Electrical equipment construction business
  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 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.
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 its kind in Japan, to the Shin-Meishin Expressway (from Takatsuki JCT/IC to Kobe JCT).

Sign lighting refers to tunnel lighting that glows white, which flashes red during a vehicle fire, and flashes yellow in the event of abnormalities such as accidents, falling objects, or broken-down vehicles, alerting drivers. This allows drivers to drive with peace of mind.

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The first pacemaker light using tunnel lighting fixtures in the country.

We have delivered the first-ever tunnel lighting fixtures using pacemaker lights on the Shin-Meishin Expressway (Takatsuki JCT/IC to Kobe JCT) in Japan.

The Pace Maker Light is a tunnel lighting system that shines white and has green lights illuminating in the direction of travel, creating a flow of light that drivers feel compelled to match in speed, helping to restore speed and alleviate traffic congestion. Conversely, when drivers exceed the green light, the Pace Maker Light serves as a technology that assists in speed regulation.

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星和電機
Electrical equipment construction business
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Earthquake measures for elderly welfare facilities

[Case Study] Introduction of earthquake measures for factories and waste treatment facilities. Emergency shutdown of factory equipment during an earthquake!

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The seismic sensor device "HK-2" detects strong tremors equivalent to a seismic intensity of 5 or higher, transmits a signal to the control room, and emergency stops the facility equipment. 【Installation Location】 Automotive parts factory 【Challenges】 Due to the maintenance and replacement of the factory equipment control devices, we considered updating the existing seismic sensors as well, but since production had already ended, we were looking for alternatives. 【Effects After Installation】 The HK-2 has the function to emergency stop equipment during an earthquake, and since its functionality is the same as the existing device, it was introduced as a replacement. Its compact size also allowed it to fit within the existing control panel being used. ★See more examples of the seismic sensor device "HK-2" https://www.hotron.co.jp/recommend/HK-2_lp.html#anchor_a04 ◎For more details, please download the materials or contact us.

Jan 09, 2026

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When the sensor detects a car, it notifies pedestrians of the car's departure with the light of a rotating beacon!

Perfect for entrances and exits of parking lots and stores! Notify pedestrians of vehicle departures with the light from the rotating lamp! Here is a proposal for a departure warning sensor!

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  • CATALOG

[To the owners of parking lots and parking lot construction companies] "I am worried about the possibility of colliding with pedestrians when exiting the parking lot..." Among vehicle entrances to parking lots, stores, residences, and factories, those particularly facing sidewalks or roadways are expected to pose risks of dangerous incidents such as pedestrian collisions and vehicle-to-vehicle accidents. To alleviate such concerns, Hotron proposes a [Vehicle Exit Warning Sensor] that detects vehicle departures at various sites and alerts the surrounding area with LED lights and buzzers. The system consists of a simple configuration of "Sensor" + "Controller" + "Switching Power Supply (24V)" + "LED Rotating Light." *When using the exit warning system, we kindly ask that you arrange for the switching power supply (24V), LED rotating light, control panel, circuit breaker, etc. Since it can be retrofitted, it can also be used for existing parking lot entrances. [Contents Included] ○ Exit Warning System Configuration ○ Comparison Table of Exit Warning Sensors ○ Four Modes ○ Wide Range of Applications ○ Customer Feedback ○ Appearance Diagram / Specifications ◎ For more details, please contact us or download the catalog.

Jan 08, 2026

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[Free Catalog Distribution] Measures for "Near Misses" in Nursing and Care Settings. Prevent tripping and disconnection with codes! Wireless Series Bed Exit Sensors Linked to Nurse Call Systems.

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  • CATALOG

In facilities operating nurse call systems, we have made bed exit sensors wireless, allowing them to notify in conjunction with the nurse call system. By simply connecting the mat sensor "Foldable Thin Matt-kun," the body movement call "Ugo-kun," and the wheelchair body movement call "Ayumi-chan" to the transmitter HB-RS, you can make the bed exit sensor wireless. The infrared sensor "Just Place Pole-kun" has the transmitter HB-RS built-in. This helps prevent accidents caused by falls, slips, or wandering, contributing to the efficiency of medical operations. 【Features】 ○ Wireless conversion by simply connecting existing sensors to the transmitter HB-WSK. ○ Bed exit sensors notify wirelessly in conjunction with the nurse call system. ○ Up to 5 transmitters can be registered with one receiver. ○ The communication distance between the transmitter and receiver is approximately 10 meters. ◎ For more details, please contact us or download the catalog.

Jan 08, 2026

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Brochure cover

We have renewed the brochure (Soil Contamination Survey and Measures).

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  • CATALOG

We have renewed our brochure regarding "Soil Contamination Investigation and Measures." Soil contamination investigation and measures require complex and specialized knowledge, including legal regulations, investigation obligations, and countermeasure methods. In this brochure, we have systematically organized the overview of legal regulations and various countermeasures to make it easier for those unfamiliar with the Soil Contamination Countermeasures Act and the Water Pollution Prevention Act to understand. Additionally, we have included a flowchart indicating "when soil investigation is necessary," allowing businesses to grasp the relevant situations for themselves. By clarifying "what needs to be done now," we support decision-making for companies engaged in environmental risk management. The structure is designed to be easy to understand even for those encountering the Soil Contamination Countermeasures Act for the first time, so please take a look. For more details, please refer to the news page on our company website linked in the related links section. 【Contact Information】 Mitsubishi Material Tech Corporation, Sales Planning Department (Weekdays 9 AM - 5 PM) 03-6628-6905 or contact form

Jan 08, 2026

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Is the quality of work determined by "fragrance"? Three reasons to introduce aroma in the office.

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"This company has a nice atmosphere..." The reason might be the "scent" of the space. Why scent in the office now? Just by introducing scent, the quality of the office dramatically improves. 1. Visitor Reception: Enhancing the Quality of Hospitality Just having a pleasant scent wafting through the entrance and reception room gives visitors a positive first impression of a company that pays attention to detail. 2. Increased Concentration: Towards a More Productive Workplace Scent directly brings relaxation and refreshment effects to the brain. It supports mood changes during work breaks and helps maintain concentration during long hours of desk work, leading to improved employee performance. 3. Enhanced Corporate Image (Branding) The memory of "that office always has a nice scent" quietly and surely enhances the company's brand image. It becomes a powerful tool for differentiating from other companies. Start with a "Free Trial Installation" If you want to improve the atmosphere of your office and create a more comfortable working environment for your employees, why not try the power of scent? Please feel free to contact us.

Jan 08, 2026

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  • 【新型モデル誕生】2026年トップランナー変圧器搭載キュービクル NEW SOLAR SPEC M
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