A LED lighting engineer designs a street lighting system using 120 COB LEDs, each dissipating 3.2 watts. If the system operates for 10 hours per night and electricity costs $0.14 per kWh, what is the nightly operating cost? - Sterling Industries
How Much Does It Cost to Power a Street Lighting System Designed by a Professional LED Engineer?
How Much Does It Cost to Power a Street Lighting System Designed by a Professional LED Engineer?
Cities nationwide are shifting toward smarter, energy-efficient street lighting—driven by rising electricity costs and a growing focus on sustainability. A common project today involves engineers designing precise street lighting systems using high-performance COB (Chip-on-Board) LED arrays. When combining these with real-world operating conditions, many want to understand the true nightly expense.
This particular example? A lighting engineer designs a system using 120 COB LEDs, each drawing just 3.2 watts. With the lights on for 10 hours each night, and electricity priced at $0.14 per kilowatt-hour, the operating cost reveals a clear path to efficient urban management.
The nightly cost is calculated by determining total power use, then multiplying by usage time and rate. With 120 LEDs at 3.2 watts each, total power consumption reaches 384 watts—equivalent to 0.384 kilowatts. Multiply by 10 hours: 3.84 kWh. At $0.14 per kWh, the nightly expense totals $0.5376—nearly 53 cents per night.
Understanding the Context
This figure reflects modern efficiency standards; older systems often waste far more energy. LEDs like these deliver intense, reliable light while minimizing waste—key for budget-conscious municipalities and businesses prioritizing both performance and savings.
Though focused on cost, this system exemplifies how precision engineering and smart electrical design converge in urban infrastructure. For curious readers interested in sustainable technology or local lighting projects, understanding power consumption helps inform smarter investments.
That thoughtful planning doesn’t just reduce bills—it improves safety, extends equipment lifespan, and supports broader energy goals. When low energy use aligns with cutting-edge design, cities gain better lighting, lower
