When evaluating lighting systems for large-scale facilities, annual energy consumption is a critical factor. This article estimates and compares the energy use of LED (Light Emitting Diode) and HID (High-Intensity Discharge) systems over a one-year period.

Consider a typical warehouse requiring 100 fixtures operating 12 hours per day, 365 days per year. HID systems often use 400W per fixture including ballast losses. Total annual energy consumption for HID: 100 fixtures × 0.4 kW × 12 h × 365 days = 175,200 kWh.

LED fixtures providing equivalent lumens (around 25,000 lumens) typically consume only 150W per unit. Annual LED consumption: 100 × 0.15 kW × 12 × 365 = 65,700 kWh.

The difference is significant: LEDs consume approximately 62.5% less energy than HID. At an average electricity rate of $0.12 per kWh, annual cost savings reach $13,140. Additionally, LEDs have a lifespan of 50,000+ hours versus 15,000 hours for HID, reducing maintenance frequency and replacement costs.

Other factors include heat output: LEDs generate less heat, lowering HVAC loads in climate-controlled spaces. Instant on/off capability also eliminates HID's warm-up and restrike delays, improving operational efficiency.

In conclusion, upgrading from HID to LED can reduce annual energy consumption by over 60%, offering substantial financial and operational benefits for industrial and commercial applications. Accurate estimation using local operating hours and utility rates remains essential for precise ROI calculations.