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The LED vs. incandescent debate has been settled for years. But the specifics are worth knowing — especially for desk use, where the numbers look different than whole-home lighting.
Side-by-side comparison
| Factor | LED desk lamp | Incandescent desk lamp |
|---|---|---|
| Wattage (400 lm output) | 4–6W | ~40W |
| Annual energy cost | ~$1.20 | ~$9.60 |
| Rated lifespan | 20,000 hrs | 1,000 hrs |
| Heat output | Minimal | Significant (~90% waste heat) |
| Instant-on | Yes | Yes |
| Dimmable | Most models | Yes (with compatible dimmer) |
| Color temperature options | Wide range available | Warm white only (~2700K) |
| Mercury content | None | None |
The heat problem with incandescent
Incandescent bulbs convert about 90% of energy to heat, 10% to light. That heat output is actually relevant for a desk lamp — positioned close to your working area, an incandescent runs noticeably warm. Some older gooseneck desk lamps with incandescent bulbs got actually hot to the touch near the head. LEDs run near room temperature.
The lifespan math
At 8 hours/day: a 1,000-hour incandescent lasts about 125 days (4 months). A 20,000-hour LED lasts about 6.8 years. You replace the incandescent roughly 20 times before the LED needs replacing once. The “cheaper upfront” argument for incandescent doesn’t survive this math.
Is there any reason to buy incandescent today?
For a desk lamp specifically: no. They’re inefficient, run hot, burn out constantly, and only produce warm white. LEDs cover everything incandescent does and more. The only scenario where incandescent is still defensible is specialty applications (heat lamps, certain photography uses, vintage fixtures where aesthetics matter). Desk lighting isn’t one of them.
