LED vs HPS lighting comparison: efficacy (130-180 lm/W vs 80-140 lm/W), CRI (80+ vs 20-25), lifespan (50,000h L70 vs 24,…
High Pressure Sodium (HPS) dominated street and area lighting for 40+ years — but every watt consumed by HPS now costs 50-70% more than LED for equivalent illuminance. The physics is straightforward: HPS converts only 30% of input power to visible light (the rest is infrared heat), while modern LED arrays achieve 40-50% wall-plug efficiency. With 150,000+ municipal LED conversions worldwide since 2015, the technology transition is a question of timing, not if.
This comparison covers roadway (AASHTO/CIE 115), area (IES RP-20), and security lighting applications. Key differentiators beyond lm/W: scotopic/photopic (S/P) ratio — HPS at 0.6 vs LED at 1.8-2.2 — which means LED appears 2-3× brighter to the human eye at equal photopic lux, enabling significant wattage reduction while maintaining perceived safety. Standards referenced: ANSI C136 (roadway), IES RP-8 (roadway lighting), EN 13201 (European road lighting).
| Comparison | Option A | Option B | Winner |
|---|---|---|---|
| Efficacy | 130-180 lm/W | 80-140 lm/W | LED (30-60% more efficient) |
| CRI (Color Rendering) | 80+ Ra | 20-25 Ra (monochromatic orange) | LED (3-4× better) |
| Lifespan (L70) | 50,000-100,000 hours | 15,000-24,000 hours | LED (3-5× longer) |
| Warm-up Time | Instant on | 3-5 minutes to full brightness | LED (instant) |
| CCT Options | 2200K-6500K full range | 2000-2200K only (yellow-orange) | LED (full spectrum) |
| Dimming | 0-10V / DALI (0-100%) | Limited (special ballast, 50-100%) | LED (full dimming) |
| 5-Year TCO (100 fixtures) | $12,000-22,000 | $28,000-45,000 | LED (50-60% savings) |
| Best Applications Today | Streetlight, area, warehouse, all new installs | Legacy: existing street/area lights being phased out | LED (new standard) |
LED outperforms HPS in every measurable dimension: 30-60% higher efficacy, 3-5× longer lifespan, dramatically better color rendering (CRI 80+ vs 20-25), instant-on, and full CCT flexibility. HPS is effectively obsolete for new installations — most municipalities and industrial facilities are actively replacing HPS with LED. The 5-year TCO advantage of LED is 50-60%. If you have existing HPS fixtures, LED retrofit kits or full fixture replacement both offer ROI within 1-3 years.
Efficacy gap. HPS: 80-140 lm/W (high-wattage 400-1000W) at 2,000K with CRI ~20-25. LED: 130-200 lm/W at 3,000-5,000K with CRI 70-90. The critical nuance: at 2,000K (HPS native CCT), the human eye's scotopic sensitivity is near-zero — you see brightness but not detail. LED at 4,000K activates both photopic and mesopic vision, improving object recognition distance by 40-80% in studies (DOE GATEWAY demonstrations, 2013-2019).
Lumen maintenance. HPS: 70% lumen maintenance at 24,000 hours, but many municipalities run lamps to 30,000-40,000 hours at 50-60% output — the amber color masks depreciation. LED: L70 at 50,000-100,000 hours (IES LM-80/TM-21 projections). For a street light operating 4,380 hours/year (12h/night), this is 11-23 years before reaching 70% output.
Optical control. HPS: omnidirectional source requires reflector — typically 60-70% optical efficiency with significant spill light. LED: directional source with precision optics — 85-95% optical efficiency, zero uplight (IDA Dark Sky compliant), and sharp cutoff (BUG rating B0-U0-G0-2 achievable). This matters for municipal light pollution ordinances and LEED/BREEAM credits.
| Parameter | HPS 250W | LED 100W | Savings |
|---|---|---|---|
| System Wattage | 295W (with ballast) | 100W | 66% |
| Annual Energy (4,380h) | 1,292 kWh | 438 kWh | 66% |
| Lamp Life (L70) | 24,000h (5.5 yr) | 100,000h (23 yr) | 4× |
| CRI / CCT | 25 / 2,000K | 70-80 / 3,000-4,000K | 3-4× CRI |
10-year TCO per fixture: HPS: $1,975 (energy $1,550 + maintenance $425). LED: $655 (energy $526 + maintenance $129). Savings: $1,320/fixture (67%). For a 5,000-fixture municipal system: $6.6M savings over 10 years.
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