led vs incandescent: Complete Comparison

LED与白炽灯：全面对比

Head-to-Head Comparison

Detailed Analysis

1. Performance

Let's start with efficacy — the big one. A quality LED panel at 4000K delivers 120–140 lumens per watt, tested per IES LM-79. An incandescent A19 bulb? You're looking at 10–17 lm/W. That's roughly a 10x difference. What does this mean in practice? A 10W LED replaces a 60W incandescent while producing the same 800 lumens. I've seen facilities cut their lighting load from 40 kW to 4 kW just by swapping out PAR38 floods in a warehouse. The savings are real.

Lifespan is where it gets absurd. LEDs are rated for 50,000 hours L70 per IES LM-80 — that's the time until the light output drops to 70% of initial. Incandescent bulbs die at 1,000–2,000 hours per ANSI C78.20. So one LED lasts as long as 25–50 incandescent bulbs. I've been on job sites where maintenance crews were relamping every three months; switching to LED turned that into a once-a-decade task. The catch: cheap LEDs with poor thermal management can fail early. Stick to brands that publish LM-80 data.

CRI is the one metric where incandescent still wins — it's a perfect 100 because it's a blackbody radiator. LEDs typically hit 80–90, though premium COB LEDs now reach 95+. For retail or art galleries, that matters. For a warehouse or office? You won't notice the difference.

2. Cost Analysis

Upfront cost is the only place incandescent looks good — a standard 60W-equivalent bulb costs $1–$2 versus $3–$8 for LED. But here's the thing: that $1 bulb will cost you $60–$96 in electricity over 10,000 hours at $0.12/kWh. The LED? $8–$12. Add in the fact that you'll buy 25 incandescent bulbs in that time versus one LED, and the math is brutal. Payback period for LED is typically under 6 months in commercial settings with 12-hour daily operation.

Maintenance costs are often overlooked. Every time a maintenance worker climbs a ladder to replace a bulb, that's labor cost — $50–$150 per trip in commercial buildings. With incandescent, you're doing that every year. With LED, maybe once a decade. I've seen schools spend $20,000 annually on lamp replacement; switching to LED cut that to $2,000. Bottom line: total cost of ownership favors LED by a factor of 5–10 over 10 years.

3. Application Suitability

LED dominates general lighting: offices, warehouses, parking lots, street lighting, retail. It's also the only choice for outdoor applications where cold temperatures kill fluorescent and incandescent efficiency. Incandescent still makes sense for three specific use cases: oven and appliance lighting (high heat), vintage/Edison bulb aesthetics in restaurants or homes, and theatrical fixtures where instant full brightness and perfect dimming are required. For everything else, LED is the default.

4. Pros & Cons

LED Pros: 10x efficacy, 25–50x lifespan, instant-on, no UV/IR, wide CCT range, dimmable with proper driver, no mercury. Cons: Higher upfront cost, potential flicker with poor dimmers, color shift over life, heat-sensitive (needs heatsink).

Incandescent Pros: Lowest upfront cost, perfect CRI, smooth dimming, warm light, works in high heat. Cons: 90% of energy wasted as heat, short lifespan, fragile filament, no CCT options, banned in many jurisdictions under energy regulations.

Best Use Cases

Final Recommendation