led vs high pressure sodium: Complete Comparison

LED与高压钠灯：完整对比

Head-to-Head Comparison

Detailed Analysis

1. Performance

Let's start with the numbers that matter most on a spec sheet. A typical 400W HPS lamp delivers around 50,000 lumens — that's 125 lm/W at the lamp, but by the time you account for ballast losses and fixture optics, system efficacy drops to 80–95 lm/W. Compare that to a 150W LED high-bay fixture that puts out 21,000 lumens at 140 lm/W. You're getting the same light output from 40% less power. I've seen this play out on job sites: a warehouse retrofit that swapped 400W HPS for 150W LED cut energy bills by 55–60% while maintaining measured foot-candle levels per IES RP-7.

Lifespan is where the gap really widens. HPS lamps are rated for 24,000 hours at best — and that's under ideal conditions with stable voltage. In practice, I've seen them fail at 18,000 hours in parking lots with voltage fluctuations. LED fixtures rated per IES TM-21 typically hit L70 at 50,000 hours minimum, with many premium drivers pushing past 100,000 hours. What does this mean in practice? You'll relamp an HPS fixture 2–3 times over the life of a single LED installation. That's not just lamp cost — it's the labor, the lift rental, the downtime.

Color quality? HPS tops out at CRI 30. That's why everything looks orange and flat. LED gives you CRI 80+ as standard, and if you're doing retail or inspection work, you can spec CRI 90+ without breaking the bank. The CCT flexibility alone — from 2700K warm to 5000K daylight — makes LED the only choice for spaces where color discrimination matters.

2. Cost Analysis

Here's where procurement folks get nervous: upfront cost. A 150W LED high-bay fixture runs $150–$300, while a 400W HPS fixture with lamp and ballast is $80–$150. So HPS wins the first-cost battle by about 2:1. But that's the only cost metric it wins.

Run the numbers over 10 years. A 400W HPS fixture burning 12 hours a day at $0.12/kWh costs $210/year in electricity. The LED equivalent? $120/year. That's $900 saved per fixture over a decade. Add in relamping: HPS needs a new $15 lamp every 3 years plus $40 in labor — that's $550 over 10 years per fixture. LED needs nothing. Total cost of ownership: LED saves $1,200–$1,500 per fixture over 10 years. Payback period is typically 1.5–2.5 years depending on local utility rates and any rebates. I've seen facilities with 18-month paybacks in states with aggressive energy efficiency programs.

3. Application Suitability

HPS still has a home in a few niches. If you're lighting a foundry where ambient temps hit 60°C, some HPS fixtures will outlast LED drivers that thermally throttle. But that's a shrinking edge — modern LED drivers rated for 70°C ambient are now common per IEC 62384. For everything else — warehouses, parking lots, street lighting, gymnasiums, cold storage — LED is the obvious choice. The instant-on and instant-restrike capability of LED is a killer feature for security lighting and spaces where motion sensors are used. HPS's 3-minute warm-up makes it useless for occupancy-based control.

4. Pros & Cons

LED Pros: 40–50% energy savings vs HPS; 50,000+ hour lifespan; instant on/off and dimming; CRI 80+ standard; zero mercury; full CCT range; 5–10 year warranty. LED Cons: Higher upfront cost; sensitive to high ambient temps (though improving); some early products had driver failure issues (avoid no-name drivers).

HPS Pros: Low initial fixture cost; proven reliability in extreme heat; simple replacement cycle. HPS Cons: Poor CRI (22–30); 3–5 min warm-up; mercury content; 24,000–40,000 hour lifespan; no effective dimming; 1–2 year lamp warranty.

Best Use Cases

Final Recommendation