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The environmental case for LED over incandescent and CFL is clear. Here’s the actual data, not the marketing version.
Energy use over a lifetime
A 6W LED that replaces a 60W incandescent uses 90% less electricity for the same light output. Over a 20,000-hour lifespan (the typical LED rating), that’s 1,080 kWh saved per bulb. At the average US grid carbon intensity, that’s roughly 430 kg of CO2 avoided per LED bulb over its life, compared to incandescent replacements.
The manufacturing offset
LEDs have higher manufacturing carbon cost than simple incandescents. But the break-even point — where the LED’s lifetime energy savings exceed the manufacturing carbon — is typically reached within the first 1,000–2,000 hours of use. For a desk lamp running 8 hours/day, that’s about 4–6 months. After that, net environmental benefit is continuous.
The CFL/mercury problem
Compact fluorescent lamps (CFLs) contain mercury — typically 3–5 mg per bulb. They require special disposal (not regular trash). LEDs contain no mercury. This is a genuine, non-trivial environmental advantage for LED over CFL. A broken CFL indoors is a small mercury exposure event; a broken LED is just broken glass.
Longevity and waste reduction
A single LED lamp replaces approximately 20 incandescent bulbs over its lifetime (based on rated hours). Less manufacturing, less packaging, less disposal. The waste reduction math is significant at scale even if it feels trivial for one desk lamp.
The honest caveat
LED disposal isn’t perfect either — they contain small amounts of lead and arsenic in some components. They’re not considered hazardous waste at the quantity of a household item, but they shouldn’t go in regular recycling. Most home improvement stores accept LED bulb recycling for free. Worth doing for large quantities; don’t stress about a single desk lamp.
