SolarToolsLED vs Incandescent: The Real Payback Math
Why swapping to LED is the highest-ROI energy upgrade you can make — and the few cases it isn't.
LED lighting is the lowest-hanging fruit in home energy efficiency. A single 60W incandescent replaced with a 9W LED saves $15/year if used 8 hours/day. At $2 per bulb, payback is 7 weeks. There's no energy upgrade with a faster payback. Yet many homes still have incandescents in closets, garages, and outdoor fixtures.
At a glance
LED Bulb (9W, 60W equivalent)
- Power consumption
- 9 watts
- Light output
- 800 lumens (60W incandescent equivalent)
- Lifespan
- 15,000–25,000 hours
- Color temperature
- 2700K (warm) to 5000K (daylight)
- Annual energy cost (8h/day)
- $4.20 @ $0.16/kWh
- Heat output
- Minimal
Incandescent Bulb (60W)
- Power consumption
- 60 watts
- Light output
- 800 lumens
- Lifespan
- 1,000 hours (~1 year at 3h/day)
- Color temperature
- 2700K (warm)
- Annual energy cost (8h/day)
- $28.00 @ $0.16/kWh
- Heat output
- Significant (90% of energy becomes heat)
Full specification comparison
| Spec | LED Bulb (9W, 60W equivalent) | Incandescent Bulb (60W) |
|---|---|---|
| Power consumption | 9 watts | 60 watts |
| Light output | 800 lumens (60W incandescent equivalent) | 800 lumens |
| Lifespan | 15,000–25,000 hours | 1,000 hours (~1 year at 3h/day) |
| Color temperature | 2700K (warm) to 5000K (daylight) | 2700K (warm) |
| Annual energy cost (8h/day) | $4.20 @ $0.16/kWh | $28.00 @ $0.16/kWh |
| Heat output | Minimal | Significant (90% of energy becomes heat) |
Pros and cons
LED Bulb (9W, 60W equivalent)
Pros
- Uses 85% less electricity than incandescent
- Lasts 15–25 years (vs 1 year for incandescent)
- Instant on, no warm-up
- Available in dimmable and smart variants
- Cool operation — reduces AC load
- Mercury-free (unlike CFL)
Cons
- Slightly higher upfront cost ($2 vs $0.50)
- Some cheaper brands flicker or have poor color rendering
- Dimming requires compatible dimmer switch
- Very cheap LEDs may fail early (buy reputable brands)
Incandescent Bulb (60W)
Pros
- Cheap upfront ($0.50 per bulb)
- Perfect color rendering (100 CRI)
- Works with any dimmer
- Instant on
- Warm light many people prefer
Cons
- Uses 6.7× more electricity than LED equivalent
- Lasts only 1 year (vs 15+ for LED)
- 90% of energy becomes heat — increases AC load
- Banned for many applications in US since 2023
- Frequent replacement hassle
- Fire risk in enclosed fixtures
LED wins decisively. A single LED saves $24/year in electricity vs incandescent (at 8h/day, $0.16/kWh), pays back in 7 weeks, and lasts 15+ years. There is no legitimate reason to use incandescent bulbs in 2025 — the US has effectively banned them for most applications. The only exception: specialist bulbs (oven, refrigerator, vintage decorative) where LED equivalents don't yet exist or cost $15+.
The math is undeniable
One 60W incandescent at 8h/day = 175 kWh/year = $28/year. One 9W LED at 8h/day = 26 kWh/year = $4.20/year. Annual savings: $23.80. Bulb cost: $2. Payback: 31 days. Over the LED's 15-year life: $357 in savings per bulb.
Replace 20 bulbs = save $475/year
A typical home has 20–40 light bulbs. Replacing 20 incandescents with LEDs costs $40 and saves $475/year. There's no other energy upgrade with this ROI.
Color quality matters
Early LEDs had harsh blue light and poor color rendering. Modern LEDs (especially 2700K "warm white" with 90+ CRI) are indistinguishable from incandescent. Look for CRI 90+ on the packaging. Avoid anything below 80 CRI.
Smart LEDs (Philips Hue, LIFX)
Smart LEDs cost $25–$45 each but add scheduling, dimming, color changing, and home automation integration. Worth it for living spaces; overkill for closets and garages. Payback is 2–3 years due to scheduling features that turn lights off automatically.
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