What is the lifespan of high-mast light bulbs and fixtures?

The lifespan of the light sources and fixtures used in high-mast lighting varies by type:

Traditional High-Pressure Sodium (HPS) / Metal Halide (MH) lamps: Bulb lifespan is approximately 10,000–20,000 hours (L70), and ballast lifespan is about 30,000–50,000 hours, though the fixture housing and reflector can last over 10 years. In practice, bulbs are typically replaced annually (based on 12 hours of nightly operation), while ballasts are replaced every 3–5 years.

LED fixtures: The lifespan of LED chips (L70) is typically 50,000–100,000 hours, while the LED driver lifespan is about 30,000–50,000 hours (limited by electrolytic capacitors). Consequently, under normal use, LED high-mast lights do not require a light source replacement for 5–8 years, although drivers may begin to fail around the 5-year mark.

Poles and luminaire carriages: Hot-dip galvanized steel poles can last 20–30 years, though they require periodic inspections for corrosion. The steel cables in the lifting system have a lifespan of approximately 5–8 years and should be replaced based on wear. To extend the overall service life, high-quality LED components and drivers should be selected, and proper measures for lightning protection, heat dissipation, and sealing must be implemented. Once the LED fixture experiences 30% lumen depreciation, replacing the module or the entire fixture may be considered to restore initial illuminance levels