Case Study


East Japan Railway Company

Significantly improving maintenance efficiency with LED lights at high places Brightening the station concourse, and improving customer service



Purpose of Implementation

Improved efficiency, Reduced costs, Improved service

Implemented product
LED lights

Lighting for high ceilings

DL-EH401N, DL-YPH04×2, DL-EHK10, DL-EHK08, Total 18 sets
In March 2018, the Odawara Station concourse lighting was replaced from the existing mercury lamps to the Sharp LED lights.

East Japan Railway Company

Shibuya, Tokyo (Head office, Japan)
Established in 1987, the business area extends over 17 prefectures from the Kanto and Koshin-etsu to Tohoku area. The railway distance covers a total of 7401 kilometers serviced by 69 lines. Japan's largest railway company transports a total of 6.549 billion passengers (FY2018).
JR East Odawara Station (this solution) / Odawara City, Kanagawa Prefecture

This is what we realized.
Challenges before implementation

Mercury lamps were used as ceiling lights of Odawara Station located near Odawara Castle and Hakone, known as popular tourist spots in Japan. The arch-shaped ceiling was high, reaching 12m at the highest point. As the time and costs for servicing the lights were high, and because the production of mercury lamps has been discontinued, we promoted the use of the long-life LED lights.

  • Serviceability is greatly improved with the 60,000-hour long life. This helps cost reduction.
  • The brighter station received high praise from the customers. The lights turn on instantly, making station service smoother.
  • Respond to urgent need for LED lights at stations, where obtaining mercury lamps is becoming increasingly difficult.
Background of Implementation
Maintenance and management of mercury lamps take time and cost, so we want to improve maintainability with long-life LED lights.

The Odawara Station concourse has an arch-shaped ceiling that reaches 12m at its highest point. Maintenance and management of the mercury lamps that were installed on the ceiling took enormous time and costs. There was limited time to replace the lamps and conduct periodic inspections because we had to wait for the last train and all assengers to leave, so we could only work on one or two lamps a day. We had to assemble footing and work at high places. As a solution, we considered the long-life LED lights that would improve maintainability and save energy at the same time.

(Left)East Japan Railway Company
Yokohama Power Technology Center
Power Path Engineering Section 2,
Section Leader
Takeyasu Nakazawa
(Right)JR East Facility Management Co., Ltd.
Yokohama Branch,
Assistant Branch Manager
Minoru Sugiyama

Reasons for Selection
Lighting simulations gave a convincing brightness.
The decorative covers with simple design were also popular.

Sharp proposed the LED high ceiling lighting. First, we were impressed by the high luminous flux maintenance factor that can keep brightness to the end of the life. Sharp promptly arranged a simulation to show the brightness when the mercury lamps were replaced with LED lights. We saw that the lights were much brighter than mercury lamps, and were able to come to a smooth decision to implement the LED lights. The appearance of the lighting fixture's simple decorative cover was favorable for a station concourse used by many customers.

Maintainability at the 12m high ceiling is greatly improved with long-life LED lights

Effect after implementation
Customers say, "It's a brighter space." The lights turn on immediately, avoiding a dim lighting situation.

The lights on the concourse are turned on for more than 20 hours a day. By introducing the LED lights, the lighting life has been extended to approx. 60,000 hours, leading to less maintenance and lower costs. The customers say, "It's a brighter space." Because power is managed by JR East, the lights go off for an instant when the power is switched. The LED lights come on instantly when the power is turned on again, so the dim period can be shortened. This is advantageous for the station workers as well.

Simple decorative covers blend in with the station space

Future prospects
In the future, all station lighting will be switched to LED lights. We look forward to the long-life, high-quality products.

Due to discontinue production of mercury lamps and fluorescent lights, and growing demands to prevent global warming. In response, Odawara Station will switch to 100% LED lights in the future. Lighting is an important facility in the station. We hope to update to LED lights as soon as possible, and look forward to using these long-life, high-quality products.

The customers are happy with the brighter concourse

Issued August 2019