— Industry Insights
Lighting Engineering,
Lighting Engineering,
Explained.
Engineering-focused articles on industrial lighting, hazardous-area compliance, and lighting design — written by Sunjoylight's product engineers, not by marketers.
Latest Energy
400W Metal Halide LED Equivalent: The Honest Numbers
A 400W metal halide high bay draws about 455 W and is replaced by 150–200 W of LED. Ballast losses, lamp depreciation and optics set where you land.
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Categories:
Lighting Design
3000K vs 4000K Street Lights: How to Decide by Road Type
Lighting Design
High Bay Wattage by Ceiling Height: Chart and How to Check
Technical
How to Read an LED Lighting Datasheet: 20 Specs That Matter
Lighting Design
Industrial Lighting Design Basics: A Buyer's Guide
Lighting Design
Parking Lot Lighting: Pole Height, Spacing and Lux Levels
Solar
Solar Street Light Wattage: What the Listed Number Means
Solar
Why Solar Street Lights Fail: 7 Causes and How to Diagnose
Lighting Design
Street Light Pole Height and Spacing Chart (4–12 m)
Lighting Design
Agricultural Lighting: Which Lux Number Actually Governs
Compliance
Coal Handling and Processing Lighting: Not a Mine Spec
Compliance
Is It DLC Listed? What the Question Actually Gates
Lighting Design
Low Bay vs High Bay: The Boundary Is Not a Height
Lighting Design
Cold Storage Lighting: What Actually Fails at -25°C
Technical
LED Colour Temperature: Choosing Between 3000K, 4000K and 5000K
Lighting Design
Marine and Offshore Lighting: Salt, Vibration and the Certification Question
Lighting Design
Mining Site Lighting: Surface, Processing Plant and Underground
Lighting Design
Football Pitch Lighting: Levels, Pole Layouts and What Actually Drives Cost
Markets
Tooling and Mold Ownership in OEM LED Projects: What to Settle Before You Pay
Compliance
Zone 1 vs Zone 2 Lighting: What Actually Changes in the Specification
Energy
High Mast Retrofit: Converting HID High Mast Lighting to LED
Lighting Design
Port and Terminal Lighting: A Zone-by-Zone Design Guide
Technical
How to Read an IES File (And Why You Should Demand One)
Lighting Design
Warehouse Lighting Requirements: The Complete Zone-by-Zone Guide
Technical
Candela vs Lumens vs Lux: What Each One Measures
Lighting Design
UFO vs Linear High Bay: Which One Fits Your Building?
Lighting Design
LED Tri-Proof Lights: The Complete Selection Guide
Compliance
How to Choose Explosion Proof LED Lights: Selection and Verification Guide
Lighting Design
How to Choose LED Street Lights: Optics First, Wattage Second
Markets
OEM LED Lighting from China: Molds, Tooling Depth, MOQs and Certification
Lighting Design
Sports Hall Lighting: Lux Levels, Layouts and Fixtures for Indoor Courts
Lighting Design
High Mast Lighting Explained: Heights, Spacing and Fixtures
Compliance
ATEX vs IECEx: Which Certification Does Your Project Actually Need?
Lighting Design
LED Flood Light Selection: The Complete Engineering Guide (Beam, Wattage, Mounting, Aiming)
Lighting Design
How Many Lumens Does a Warehouse Need? (Per-m² Tables and a Worked Example)
Compliance
Ex Marking Decoder: Read Any Explosion-Proof Nameplate in 60 Seconds
Markets
Factory vs Trading Company in China: 12 Checks That Expose the Difference
Solar
Solar Street Lights: The Complete Guide (All-in-One vs Split, Sizing, Lifespan)
Markets
How to Import LED Lights From China: The Complete Playbook
Technical
LED Light Manufacturing Process: 8 Stages With Photos From Our Factory Floor
Markets
CE Declaration of Conformity for LED Luminaires: A Documentation Checklist
Solar
Sizing Solar Street Lights: Battery, Panel, and LED Wattage Calculations
Lighting Design
Roadway Lighting Design with EN 13201: From Photometrics to Pole Spacing
Lighting Design
Stadium Lighting Lux Levels: 75 to 500 lx by EN 12193 Class
Energy
LED High Bay Retrofit Guide: Wattage Equivalents and Light Quality Upgrades
Lighting Design
High Bay Light Spacing: A Practical Calculation Guide for Warehouses
Compliance
IEC 60079 vs GB/T 3836: A Technical Equivalence Guide for International Buyers
Compliance
GB/T 3836-2021 Explained: Understanding China's Explosion-Proof Lighting Standards
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