Short answer: For almost every home today, LED is the better choice. An LED bulb produces the same brightness as a CFL while drawing about 35% less power, lasts roughly 3–5 times longer, turns on instantly, and contains no mercury. CFLs were a big step up from incandescent bulbs, but LEDs have overtaken them on every measure that matters — so much so that the EU banned the sale of compact fluorescent lamps in 2023. The only edge CFLs still have is a slightly lower upfront price, and even that gap has mostly closed.
| Factor | CFL | LED |
|---|---|---|
| Power for ~800 lumens (60 W-incandescent equivalent) | ~13–15 W | ~8–10 W |
| Efficacy (light per watt) | ~50–70 lm/W | ~80–110 lm/W |
| Typical lifespan | ~8,000–10,000 hours | ~15,000–50,000 hours |
| Time to full brightness | Slow (seconds to minutes, worse when cold) | Instant |
| Dimmable | Only special "dimmable" models, often poorly | Widely, smoothly |
| Cold-weather performance | Poor (dim, slow to start) | Excellent |
| Mercury content | ~1–4 mg per bulb | None |
| Disposal | Hazardous waste (mercury) | Ordinary / recyclable electronics |
| Availability (2026) | Being phased out | Standard everywhere |
Below is what those differences mean in practice, with the numbers you can plug into our free LED calculators to check your own bulbs.
How each one makes light
An incandescent bulb heats a thin filament until it glows. It is cheap but wildly inefficient — most of the energy leaves as heat, not light. CFLs and LEDs were both designed to fix that, but they do it in completely different ways.
A CFL (compact fluorescent lamp) is a folded-up fluorescent tube. It holds a small amount of mercury vapour plus argon gas; when current flows, the gas emits ultraviolet light, and a phosphor coating on the glass converts that UV into visible light. That two-step process is why a CFL takes a moment to warm up and why it contains mercury.
An LED (light-emitting diode) is a semiconductor that emits light directly when current passes through it — no gas, no filament, no warm-up. Producing light in one step, with very little wasted heat, is what makes LEDs the most efficient mainstream bulb you can buy.
Efficiency and running cost
Both CFL and LED save energy compared with incandescent, but LED is clearly ahead. For the same 800 lumens (about as bright as an old 60 W incandescent), a CFL draws roughly 13–15 W while an LED draws about 8–10 W — a saving of around 35%.
Put that in money. Running one 800-lumen bulb for 3 hours a day (≈1,095 hours a year) at $0.16/kWh:
| Bulb | Power | Energy per year | Cost per year |
|---|---|---|---|
| Incandescent | 60 W | ~66 kWh | ~$10.50 |
| CFL | 14 W | ~15 kWh | ~$2.45 |
| LED | 9 W | ~10 kWh | ~$1.58 |
The LED-vs-CFL gap is under a dollar per bulb per year — small on one bulb, but it multiplies across a whole house and stacks on top of the LED's much longer life. Rates and run-times vary, so check your own figures with the LED Savings Calculator and the Electricity Cost Calculator. To compare the raw light-per-watt of two specific bulbs, use the Luminous Efficacy Calculator.
Lifespan
CFLs typically last 8,000–10,000 hours. A good LED lasts 15,000–50,000 hours — often 3 to 5 times longer. That difference matters most in hard-to-reach or always-on fixtures, where the cost of a bulb is dwarfed by the hassle and labour of changing it.
One catch specific to CFLs: frequent on/off switching shortens their life, because each start stresses the tube. LEDs are unbothered by switching, so they suit closets, bathrooms, and motion-sensor lights where CFLs wear out early. Estimate how long a given bulb will run in your fixture with the LED Lifespan Calculator.
Light quality
Early LEDs and CFLs both had a reputation for cold, unflattering light, but both have improved. Today the practical differences are:
- Warm-up: an LED is at full brightness the instant you flip the switch; a CFL starts dim and brightens over seconds to a few minutes, and is noticeably worse in a cold garage or porch.
- Colour range: LEDs come in a wide span of colour temperatures (warm 2700 K to daylight 6500 K) and are easy to dim; CFLs offer fewer options and dim poorly.
- Colour accuracy (CRI): both are available in high-CRI versions, but good LEDs reach CRI 90+ more readily. If accurate colour matters (kitchens, bathrooms, art), compare CRI values with the CRI Calculator.
Mercury, safety, and disposal
This is the clearest win for LED. Every CFL contains a small amount of mercury — the US EPA puts it around 1–4 mg per bulb. That is why a broken CFL calls for careful clean-up and ventilation, and why spent CFLs should go to a hazardous-waste or recycling drop-off rather than the regular bin.
LEDs contain no mercury. They can be handled like ordinary electronics and recycled through standard e-waste channels. For households with children, or anywhere a bulb might get knocked, that alone is a strong reason to choose LED.
Are CFLs still worth buying in 2026?
For most people, no. The market has moved on:
- The EU banned the sale of compact fluorescent lamps in 2023 on mercury grounds, and manufacturers have wound down CFL production globally.
- Tightening lightbulb efficiency standards and falling LED prices have pushed CFLs off most store shelves in favour of LED.
- The old reason to buy a CFL — a lower sticker price than early LEDs — has largely disappeared now that basic LED bulbs are inexpensive.
The one time a CFL might still make sense is if you already own working ones or find them cheap for a low-use, always-warm indoor fixture. Otherwise, replacing a CFL with an LED pays back through lower energy use, far fewer replacements, and no mercury to worry about. (Swapping out fluorescent tubes rather than bulbs? See LED vs fluorescent.)
FAQs
Which is better, CFL or LED?
LED, for nearly every home use. It uses less power for the same brightness, lasts several times longer, turns on instantly, dims better, and contains no mercury. CFLs only lead on a slightly lower upfront price, and that gap has mostly closed.
Is a CFL brighter than an LED?
No — brightness is measured in lumens, and you can buy either technology at any lumen level. What differs is efficiency: an LED reaches the same lumens using fewer watts. A CFL may seem brighter at first only because some LEDs are sold at lower lumen outputs; match the lumens and the LED wins on running cost.
Do LEDs really last longer than CFLs?
Yes. CFLs run about 8,000–10,000 hours; LEDs commonly run 15,000–50,000 hours. LEDs also tolerate frequent switching, while repeated on/off cycles noticeably shorten a CFL's life.
Are CFLs being banned?
The EU banned the sale of compact fluorescent lamps in 2023 because of their mercury content, and manufacturers worldwide are phasing them out. Existing CFLs are still legal to use, but new stock is disappearing as LED becomes the standard.
Bottom line
CFLs were a worthwhile upgrade from incandescent bulbs, but LEDs beat them on efficiency, lifespan, instant-on convenience, dimming, cold-weather use, and safety — with no mercury to dispose of. Unless you already have CFLs in hand, choose LED. When you're ready to plan a room or work out the savings, our free LED calculators cover brightness, spacing, lifespan, and running cost. Questions about a specific fixture? Get in touch.
Jack Shi
Founder & editor, LEDaskJack Shi builds and writes LEDask, an independent LED-lighting tools project operated by clooms. He designs the calculators, checks their formulas and reference values against published engineering data, and writes the guides across the site.
