The Three Main Bulb Types
For most of the 20th century, the incandescent bulb was the only real option for home lighting. Then compact fluorescents (CFLs) offered an energy-saving alternative in the 1990s and 2000s. Today, LED technology has largely overtaken both. But each technology still has its place — or at least, a reason it might still be sitting in your home. Here's how they stack up.
Head-to-Head Comparison Table
| Feature | Incandescent | CFL | LED |
|---|---|---|---|
| Typical wattage (800 lm) | 60W | 13–15W | 8–10W |
| Average lifespan | 1,000 hrs | 8,000–10,000 hrs | 15,000–25,000 hrs |
| Energy efficiency | Low | Moderate | High |
| Upfront cost | Lowest | Moderate | Moderate–Low (falling) |
| Long-term cost | Highest | Moderate | Lowest |
| Instant full brightness | Yes | No (warm-up needed) | Yes |
| Dimmable | Yes | Rarely | Yes (labeled models) |
| Color range | Warm only | Limited | Wide (2200K–6500K+) |
| Contains mercury | No | Yes (small amount) | No |
| Heat output | Very high | Moderate | Low |
| Works in cold temps | Yes | Poorly | Yes |
Incandescent Bulbs: The Classic (But Inefficient) Standard
Incandescent bulbs produce light by heating a tungsten filament to extremely high temperatures. They render colors beautifully (CRI close to 100) and are dimmable with standard switches. However, their energy inefficiency — and the resulting heat — makes them costly to run. Many countries and regions have phased out or restricted their sale. They still appear in specialty applications: oven lights, certain decorative fixtures, and vintage-style Edison bulbs.
Best for: Vintage/Edison aesthetic, oven/appliance use, specialty applications.
CFL Bulbs: The Middle Generation
CFLs were marketed heavily in the 2000s as the green alternative to incandescents. They do use significantly less energy and last much longer than incandescents. However, they come with real drawbacks: they contain a small amount of mercury (requiring special disposal), they take time to reach full brightness, they perform poorly in cold outdoor temperatures, and they're rarely dimmable. As LED prices have dropped, CFLs have largely lost their advantage.
Best for: Budget-constrained situations where LEDs aren't yet available, or existing fixtures where you need a CFL-specific form factor.
LED Bulbs: The Clear Winner for Most Homes
LEDs (Light Emitting Diodes) produce light through a semiconductor process — no filament, no gas, no mercury. They're the most energy-efficient widely available bulb type, last the longest, produce very little heat, and are available in every color temperature and a wide variety of form factors. The upfront cost has dropped dramatically over the past decade, making them cost-competitive even at the point of purchase.
Best for: Virtually every standard home lighting application — overhead fixtures, lamps, recessed lighting, outdoor lights, and smart home setups.
When You Might Still Choose a Non-LED
- Oven and appliance bulbs: LEDs may not tolerate the extreme heat inside ovens — check specifications carefully or use rated appliance bulbs.
- Vintage Edison aesthetic: Some homeowners prefer the look of visible filaments; LED filament bulbs mimic this style while still being efficient.
- Specialized medical or horticultural lights: Some grow lights and therapy lights use specific spectrum technologies.
The Verdict
For the overwhelming majority of home lighting needs in 2025, LED is the right choice. Lower energy costs, longer lifespan, no mercury, instant brightness, wide color selection, and growing smart home integration make it the complete package. If you're still running CFLs or incandescents in your home, replacing them with LEDs is one of the best low-effort upgrades you can make.