What Prime Star does

Prime Star Co., Ltd. (プライム・スター株式会社) is a Tokyo-headquartered, privately held Japanese energy solutions company founded in March 2003 by current CEO Shimoda Chiyo, operating an integrated "Energy Loop" model spanning energy creation (solar PV), storage (batteries including redox-flow technology), efficient consumption (proprietary LED lighting under the Reach, LINDA, Colors, B-ZONE, and +Kirei sub-brands), and centralized control via a self-developed Energy Management System (EMS) layered on KNX building automation through a strategic distribution partnership with German manufacturer JUNG. The company organizes its operations into four business segments — Lighting, Control, Energy Solutions, and Resilience — and serves customers in healthcare (e.g., St. Luke's International Hospital, Japanese Red Cross Koga Hospital), education (Josai University, Nihon University Toyoyama, Keiwa College, Chiba University of Commerce), commercial facilities, factories and warehouses, retail and food service (Tully's Coffee, Colowide Group), broadcasting (Nippon Broadcasting Imagine Studio), utilities-adjacent infrastructure, and government (Gunma Prefecture Office, Yonezawa Town Hall). Notable vertical-specific deployments include Reach direct-tube LED retrofits that achieve a 40W-to-7W reduction in parking-lot lighting, EPB integrated disaster-prevention towers for BCP, and HUG portable batteries — the latter winning the 5th Japan Resilience Award Grand Prize in March 2019.

The technology stack combines proprietary LED engineering (MCPET micro-foam reflectors on Reach downlights, glare-reducing reflector optics on Reach direct tubes, Ra98 Sunlike chips on Colors products, up to 178 lm/W on Reach base lights), long-life redox-flow energy storage positioned at 2x+ lithium-ion lifespan, and vendor-free solar EPC sourcing AIKO and Canadian Solar panels with Huawei, Omron, and CHINT inverters and batteries. Prime Star also operates a licensed construction capability (特定建設業者) covering electrical, plumbing, and telecommunications engineering, and sells JUNG LS990 / LS1912 smart switches and KNX control devices in Japan. Recent product activity includes the Reach-13ARD / Reach-15ARD Ra90 high-CRI tubes launched in June 2026 for medical and surgical color-critical applications, UV-C air and surface sterilization (B-ZONE, +Kirei), and the PR-Clear non-contact temperature-screening camera.

Monetization is multi-stream: hardware sales of LED fixtures, switches, and batteries; professional services spanning electrical construction and solar EPC; managed-style EMS provision; rental and leasing including the all-inclusive まるごとリース lighting offering; and renewable energy generation and electricity sales. Distribution combines direct enterprise project sales with a dealer/agency partner network (agency login portal) and a JUNG-dedicated official EC storefront. Pricing is quote-based with no public list. Strategic capital relationships include a 2019 minority equity stake from Tokyo Electric Power Partners (TEPCO Partners) as a general shareholder, with transaction banking through Mizuho Bank and Higashi-Nippon Bank.

Name

Prime Star

Legal name

プライム・スター株式会社 (Prime Star Co., Ltd.)

Website

https://primestar.co.jp

Company type

Private

Founded year

2003

Operating status

Operating

Headcount range

101–250 employees

Short description

Prime Star is a Tokyo-based private energy solutions company that designs, distributes, and installs LED lighting, KNX building automation, solar PV, and battery/resilience products for healthcare, commercial, industrial, public-sector, and government customers across Japan.

Ownership category

akta.pro rank

Product category

LED Lighting and Energy Solutions

NAICS

Commercial, Industrial, and Institutional Electric Lighting Fixture Manufacturing (335132), Electric Lighting Equipment Manufacturing (33513)

SIC

Electric Lighting & Wiring Equipment (3640)

akta.pro primary industry

Lighting Controls & Building Integration (Drivers, sensors, dimming, lighting control panels, networked lighting) (IMAGAIAI)

akta.pro secondary industries

Lighting Controls & Smart Lighting Systems (BPABAGAC), Solar EPC & Construction (Utility-Scale, Rooftop, Balance of System) (EUAMABAB), Outdoor & Area Lighting (Street, Roadway, Parking, Flood, Sports/Architectural exterior) (IMAGAIAB), Smart Lighting & Dimming Control Installation (HSAHADAB)

Keywords

• LED lighting solutions
• Energy management systems
• Solar EPC services
• Battery energy storage
• Building automation controls

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. LED Lighting Equipment Sales: Sale of LED lighting fixtures including direct-tube lamps, downlights, base lights, high-bay lights, street lamps, and LED bulbs under proprietary Reach, Colors, and LINDA brands. Products sold to replacement markets and new construction projects.
2. Electrical Construction Services: Electrical, plumbing, and telecommunications engineering design, construction, and supervision services. Licensed construction company (特定建設業者) providing installation services.
3. Solar EPC Services: Engineering, procurement, and construction services for solar photovoltaic systems. Vendor-free approach offering flexible solutions based on customer needs for design, equipment procurement, and construction.
4. Battery and Energy Storage Systems: Sale and installation of storage battery equipment including portable HUG series batteries, EPB emergency power boxes, and redox flow batteries for resilience and renewable energy applications.
5. Control Systems and Integration: Sale of control equipment and related system integration services, primarily featuring JUNG switches and KNX-based automation solutions.
6. Energy Management System (EMS) Provision: Provision of self-developed energy management systems for integrated operation and monitoring of power generation and storage assets.
7. Renewable Energy Generation and Sales: Power generation and electricity sales using solar, wind, geothermal, and other renewable energy sources.
8. Rental and Leasing: Rental and leasing services for LED lighting equipment as mentioned in company business description.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels9 records

Core offering

Prime Star designs, manufactures, and sells LED lighting products under its proprietary Reach, Colors, and LINDA brands, and delivers integrated energy solutions spanning solar PV generation, battery storage (including redox flow and HUG portable units), KNX-based building automation through its JUNG partnership, and an in-house Energy Management System. The company also provides turnkey solar EPC services, electrical construction, "marugoto" all-inclusive lighting leasing, and UVC air purification products, selling primarily to hospitals, factories, offices, schools, and government facilities in Japan.

Product overview

Prime Star is an energy solutions company offering an integrated portfolio of LED lighting products, energy storage systems, solar power services, and building automation controls. The core product lines include the Reach Series LED linear tubes and fixtures for commercial and industrial replacement, the LINDA bulb and street light series, the HUG portable battery family for emergency/disaster use, and the EPB (Emergency Power Box) integrated emergency power station. Building automation is delivered through the JUNG switch partnership using KNX standards for integrated control. The company provides solar photovoltaic EPC services and offers UVC sterilization and air purification products. The product portfolio centers on the "energy loop" concept: creating (solar), storing (batteries), controlling (KNX/JUNG), and protecting (resilience/EPB) energy.

Differentiator

Problem solved

Functional benefit

Brands

• Reach: LED lamp product line featuring next-generation LED technology with proprietary reflectors for glare reduction and uniform lighting
• HUG
• EPB
• Colors
• LINDA
• B-ZONE
• +Kirei

Products and services

• Reach Series LED Linear Tube Lamps Next-generation LED linear tube lamps with proprietary reflective technology for uniform, glare-free, flicker-free illumination. Available in 6W–35W range with rotatable G13 socket, plastic-insulated housing, and multiple color temperatures; designed as fluorescent tube replacements in offices, hospitals, factories, and commercial spaces.
• LINDA LED Bulb Series LED replacement bulbs for general incandescent and halogen applications with E17, E26, and E39 base options covering 40W–500W equivalents. Luminous efficacy up to 150 lm/W, IP65 variants available, color temperatures 2700K–6000K.

Quantifiable outcome

• Reach 直管 series reduced 40W fluorescent power consumption to as low as 6-7W
• +3 more outcomes

Named customers27 records

Segments7 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• JUNG (ドイツ ユング社)coreTechnology or IntegrationStrategic technology partnership with German switch manufacturer JUNG for KNX-based building automation systems. JUNG provides sophisticated design switches and advanced control technology for Prime Star's automation solutions. Prime Star distributes JUNG switch products in Japan and integrates them into their 'Energy Loop' building solutions.

Scale indicators2 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Panasonic Corporation: Global Japanese electronics conglomerate with a major lighting division producing LED fixtures, controls, and integrated building solutions. Competes broadly with Prime Star's lighting and control offerings as a much larger incumbent with deeper R&D and distribution.
• Signify (Philips Lighting): Global lighting leader and parent of Philips lighting brands, offering LED fixtures, controls (including KNX-compatible systems), and connected lighting platforms. Operates globally with significant Japanese presence, competing across all of Prime Star's product categories.
• Sharp Corporation: Japanese electronics and LED manufacturer with commercial lighting and solar operations in Japan. Comparable broad-line technology competitor in Japanese LED and renewable energy markets, with far greater scale than Prime Star.
• Mitsubishi Electric Corporation: Japanese conglomerate with lighting systems and building automation divisions. Offers integrated building energy management solutions comparable to Prime Star's Energy Loop offering but at much larger scale and with broader product breadth.
• ams OSRAM: Global lighting and sensor solutions company formed from the merger of ams and OSRAM. Competes with Prime Star in LED lighting and component manufacturing for industrial and commercial applications at much larger global scale.
• Toshiba Lighting & Technology: Subsidiary of Toshiba Group focused on lighting products including LED fixtures for commercial, industrial, and residential markets. Comparable broad-line Japanese lighting manufacturer with deeper pockets and broader distribution than Prime Star.

Direct peers

• Yamada Shomei Lighting: Japanese lighting manufacturer specializing in designer and architectural lighting for residential and commercial spaces. Comparable as a Japanese specialty LED maker competing for premium specification projects.
• Endo Lighting: Japanese commercial and architectural LED lighting manufacturer specializing in high-end interior and design-oriented fixtures. Comparable to Prime Star's premium Reach and Colors offerings serving commercial, hospitality, and design-conscious customers.
• KOIZUMI Lighting Technology: Japanese LED lighting manufacturer focused on commercial, educational, and healthcare applications. Direct competitor in the Japanese institutional lighting segment where Prime Star sells its Reach series to hospitals and universities.
• Iris Ohyama: Major Japanese LED lighting and consumer-products manufacturer with a broad portfolio covering residential, commercial, and industrial lighting. Competes directly with Prime Star in the Japanese LED replacement market and has similarly expanded into broader energy and facility solutions.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/primestar_eco
• YouTubeyoutube.com/@primestar_official
• Facebookfacebook.com/primestarled
• Instagraminstagram.com/jungswitch_japan

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds1 record

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Prime Star