A Real Factory.
Real Engineers. 25 Years.
Sunjoylight is the international brand of Changzhou Shuangjia Electrical Appliance Co., Ltd. — a Chinese manufacturer engineering industrial lighting since 1999, long before LEDs became the standard. We don't trade or dropship. We manufacture every fixture we ship.
The Factory Behind the Brand
Sunjoylight is the international brand of Changzhou Shuangjia Electrical Appliance Co., Ltd., an industrial lighting manufacturer established in 1999 in Changzhou, Jiangsu — the manufacturing heart of the Yangtze River Delta. For more than two decades we have engineered lighting for the environments where failure is not an option: oil & gas facilities, mines, power plants, ports, and heavy-industrial complexes.
Everything is made in-house. From aluminium die-casting and CNC machining to SMT LED mounting, powder coating, assembly, and a full photometric and reliability testing lab, we control every stage under one roof — which is how we stand behind 50,000+ hours of maintenance-free performance and take on custom OEM/ODM projects that traders simply cannot.
Today our 150+ models — across flood, high-bay, tri-proof, explosion-proof, street, and solar families — ship factory-direct to customers in 50+ countries, always backed by the engineers who designed them.
Two Decades in a Demanding Niche
Founded in 1999 in Changzhou — the manufacturing heartland of China's Yangtze River Delta — Shuangjia began as a specialist in industrial electrical fixtures. Our founders saw a gap: the rugged, certified, long-life lighting that mines, refineries, and ports actually need wasn't being made well.
By 2010, when LED technology became viable for industrial use, we already had the engineering culture to do it right — photometric labs, salt-spray chambers, and ingress-protection testing. Every fixture is rated for 50,000+ hours of maintenance-free operation.
Answers From Engineers, Not Agents
The lighting export industry is full of trading companies — middlemen who buy from one factory, add a logo, and resell. When specifications get hard (Zone 1 explosion-proof, marine salt resistance, custom photometrics, regional certification), traders fall apart.
Sunjoylight is the factory itself. Ask for a GB/T 3836 explosion-proof luminaire with full documentation and the answer comes from the engineers who design the gasket seal — not a sales agent guessing. We work directly with project engineers, EPCs, distributors, importers, and OEM partners.
What Drives Us
To illuminate every corner of the world with reliable, high-performance lighting technology.
It is why we build for the hardest environments first — if a fixture survives a refinery, a mine, or a coastal port, it will serve any project. Reliability is the product.
To become a globally trusted partner in industrial lighting solutions.
Not just a supplier of boxes, but the engineering partner specifiers, EPCs, and brand owners return to — because the answers come from the people who design and test the fixtures.
Our Spirit
Focus, innovation, integrity, and a pursuit of excellence.
Business Philosophy
Customer-centric, quality-first, and service-driven.
Talent Philosophy
We respect, cultivate, and empower talent as the foundation of our growth.
Manufacturing Capabilities
Die-casting, SMT, coating, assembly, and a full testing lab — vertically integrated so quality and lead time stay in our hands.
Production
- CNC machining & die-casting for aluminum housings
- Automated SMT lines for LED placement
- In-house powder coating & finishing
- Automated assembly + manual final QC
Testing Lab
- Integrating sphere — lumen / CCT / CRI
- Goniophotometer — IES distribution
- IP ingress & aging / burn-in stations
- Salt-spray & thermal-shock testing
R&D Team
- Optical & thermal design engineers
- Driver & electronics development
- Certification & compliance team
- Registered design & utility patents
Certified Systems, Documented Compliance
Our factory operates ISO-certified quality, environmental, and safety management systems, with product compliance and registered patents behind the range.
Product-level marks include FCC, CE, CCC, and IP65 across the range. Certificate copies are provided with your quote — view certifications.
Six Core Product Families
From explosion-proof and high-bay to solar and street lighting — 150+ models engineered for the world's most demanding environments, plus custom-made garden and portable/specialty series on request.
LED Flood Lights
Stadium flood lights · outdoor flood lighting · industrial yard illumination
LED High Bay Lights
UFO high bay · linear high bay · warehouse & factory lighting
LED Tri-Proof Lights
Waterproof · vapor-tight · corrosion-resistant linear LED
Explosion-Proof Lights
Hazardous area lighting · oil & gas · chemical · mining
LED Street Lights
Cobra head · roadway · municipal & highway lighting
Solar LED Lights
All-in-one solar street lights · off-grid · solar flood lights
Our Journey Since 1999
Changzhou Shuangjia Electrical Appliance Co., Ltd. founded in Changzhou, Jiangsu Province.
First export orders to Southeast Asia. Quality management system formalized across production lines.
LED product transformation begins. Investment in SMT production lines and a photometric testing lab.
CE, CCC, and FCC certifications achieved across major product families. European market expansion.
Explosion-proof series launched for oil & gas applications, built to GB/T 3836 hazardous-area standards.
Solar-powered lighting series introduced. Off-grid solutions deployed across the Middle East and Africa.
Production capacity expanded with additional SMT lines and assembly stations for global project demand.
Sunjoylight launched as the global B2B brand for industrial LED lighting in international markets.
Specified for Heavy Industry Worldwide
Fixtures deployed across oil & gas, mining, ports, and manufacturing in 50+ countries — the environments ordinary lighting can't survive.
Tell us about your project.
Get a quote within 24 hours.
Share your application — environment, requirements, quantity. A real engineer responds with a tailored quote, IES files, and timeline within one business day.