LED bulbs screw in or clip in the same way as the old incandescent bulbs they replace, but a few differences matter when you're doing the swap

Replacing an LED bulb takes about 30 seconds once you know which type fits your fixture. The main step is turning off the power, unscrewing or unclipping the old bulb, and screwing or clipping in the new one. LEDs last much longer than older bulbs—often 15 to 25 years depending on use—so you won't repeat this job often. The tricky part is usually finding the right bulb type for your fixture, not the replacement itself.

Before you buy a replacement, check what's currently in the socket or look at the fixture's label. You need to know three things: the base type (how it connects), the wattage or brightness level, and whether the fixture is dimmable. Getting these wrong means the bulb won't fit, won't work, or will flicker.

Key Takeaways

  • Always turn off the power at the switch before removing any bulb, and wait a few seconds if the old bulb is warm.
  • The base type—screw (E26, E27) or pin (GU10, G9)—must match your socket exactly, or the bulb will not fit.
  • Check whether your fixture is dimmable before buying a dimmable LED, because non-dimmable LEDs on a dimmer will flicker or fail.
  • LED bulbs produce the same brightness as older bulbs at much lower wattage, so a 9-watt LED replaces a 60-watt incandescent.

Turn off the power and let the bulb cool

Switch off the light at the wall switch first. This protects you from shock and prevents the bulb from breaking if you touch a hot filament. If the bulb has been on for more than a few minutes, wait 30 to 60 seconds before touching it—even LED bulbs get warm, and touching a hot bulb can burn your fingers or cause you to drop it.

For ceiling fixtures, make sure you have a stable step stool or ladder positioned directly under the bulb. Never reach or stretch sideways from a ladder; move it instead. If the fixture is recessed into the ceiling, you may need a small step stool rather than a full ladder.

Identify the base type of your old bulb

The base is the part that connects the bulb to the socket. The two most common types are screw bases and pin bases. Screw bases look like the threads on a bolt and twist into a socket. Pin bases have two or more metal prongs that slide into slots in the socket.

Screw bases are labeled by diameter in millimeters: E26 (standard US household bulbs) and E27 (standard in Europe and many other countries) are the most common. They look identical to the naked eye. Pin bases are labeled by the distance between the pins: GU10 (common in recessed ceiling lights and track lights), G9 (small decorative bulbs), and GU5.3 (some recessed lights) are typical. If you're unsure, take a photo of the old bulb's base and bring it to a hardware store, or look at the fixture's label.

Unscrew or unclip the old bulb

For screw bases, grip the bulb gently and turn it counterclockwise until it comes free. Do not grip the glass too hard—LED bulbs are fragile. For pin bases, push the bulb gently into the socket (it will click), then twist it a quarter turn counterclockwise and pull it straight out. Some pin-base bulbs straightforward pull straight out without twisting; check your fixture's label if you're unsure.

Set the old bulb aside in a safe place. LEDs contain small amounts of mercury in some models, so do not throw them in the trash; most hardware stores and waste facilities have a bin for old bulbs.

Check the wattage and brightness of your replacement

LED bulbs use far less power than incandescent bulbs but produce the same brightness. A 9-watt LED produces about as much light as a 60-watt incandescent. The package will show both the wattage (9W) and the brightness in lumens (usually 800 to 900 lumens for a 60-watt equivalent). If you're replacing an old bulb, match the lumens, not the wattage.

The color temperature matters too. Warm white (2700K) looks like old incandescent bulbs and is common in living rooms and bedrooms. Cool white (4000K) is brighter and more neutral, often used in kitchens and bathrooms. Daylight (5000K or higher) is the brightest and bluest, used in work areas. The package will say "warm white," "cool white," or "daylight" clearly on the front.

Check if your fixture is dimmable before installing

If your light switch has a dimmer dial or slider, your fixture is dimmable. Most LED bulbs are not dimmable—they will flicker, buzz, or fail to turn on at all on a dimmer. You must buy a bulb labeled "dimmable" to use with a dimmer switch. Dimmable LEDs cost more (usually $3 to $8 per bulb instead of $1 to $3), but they are the only option that will work.

If you install a non-dimmable LED on a dimmer and it flickers, turn the dimmer all the way up to full brightness. The bulb may work at full power even though it won't dim. If it still flickers or won't turn on, remove it and replace it with a dimmable model.

Install the new LED bulb

For screw bases, align the bulb with the socket and turn it clockwise until it is snug. Do not over-tighten—stop when you feel resistance. The bulb should sit flush in the socket with no gap. For pin bases, align the pins with the slots in the socket, push the bulb in gently until you hear a click, then twist it a quarter turn clockwise. Again, do not force it.

Turn the power back on at the switch. The bulb should light when ready. If it does not light, turn the power off, remove the bulb, and check that the base is clean and the pins are not bent. Reinstall and try again. If it still does not light, the bulb may be defective—return it to the store.

Troubleshoot if the bulb flickers or won't turn on

Flickering usually means the bulb is non-dimmable and installed on a dimmer, or the bulb is defective. Turn the dimmer all the way up; if the flicker stops, you need a dimmable bulb. If the flicker continues at full brightness, the bulb is likely faulty and should be replaced under warranty.

If the bulb won't turn on at all, check that the base is fully seated in the socket. For screw bases, remove the bulb and look inside the socket for a small metal tab in the center—if it is bent down, gently pry it up with a flathead screwdriver. For pin bases, check that the pins are straight and not bent or corroded. If the socket itself looks damaged or corroded, the fixture may need repair rather than just a bulb replacement.

Frequently Asked Questions

Can I use an LED bulb in any fixture?

Almost any fixture that held an incandescent bulb can hold an LED, but recessed ceiling lights and enclosed fixtures sometimes run hot and can shorten an LED's life. Check the fixture's label for a maximum wattage or temperature rating. If it says "not for use with LED," the fixture is likely too hot or has electrical incompatibility.

Why does my LED bulb flicker when I turn the dimmer down?

Non-dimmable LEDs flicker on dimmers because the dimmer's electrical signal confuses the bulb's internal driver. You must use a bulb labeled "dimmable" with any dimmer switch. Some older dimmers are also incompatible with LEDs even if the bulb is dimmable—if flickering continues, try a different brand of dimmable LED.

What do I do with my old LED bulb?

Do not throw LED bulbs in the trash. Take them to a hardware store, waste facility, or electronics recycler that accepts bulbs. Many stores that sell bulbs (Home Depot, Lowe's, Ace Hardware) have a collection bin near the entrance or customer service desk.

How long do LED bulbs actually last?

Most LED bulbs are rated for 15,000 to 25,000 hours of use. At three hours per day, that is 15 to 20 years. The actual lifespan depends on heat, how often you turn the bulb on and off, and the quality of the bulb. Cheap LEDs may fail sooner; name brands usually last longer.

Can I use a higher-wattage LED bulb in a fixture rated for lower wattage?

Yes, because LED wattage refers to power draw, not heat output. A 9-watt LED uses far less power than a 60-watt incandescent, so it is safe in fixtures rated for 60 watts. However, check the fixture's label for any specific LED restrictions before installing.