To choose a light bulb, match the base and shape to the fixture, check brightness in lumens, and choose a color temperature that suits the room. Watts tell you how much power a bulb uses, while lumens tell you how bright it is.
Common Bulb Technologies
- LED: uses little power, runs cooler, and comes in many shapes. It is now the usual choice for most fixtures.
- Halogen: a type of incandescent bulb with crisp, bright light. It runs hot, so check the fixture limits.
- Incandescent: the older style of warm glow, which uses more power and is being phased out in many places.
- CFL: a spiral tube lamp that is slower to reach full brightness and needs careful disposal.
Reading the Package
| Term | What it means | Why it matters |
|---|---|---|
| Lumens | Amount of light produced | Higher means brighter |
| Watts | Power used | Must stay within the fixture limit |
| Kelvin (K) | Color of the light | Lower is warm, higher is cool |
| Base type | The fitting at the bottom | Must match the socket |
| Dimmable | Works with dimmers | Needs a compatible control |
Choosing by Room
Warm white light, around 2700K, gives a cozy glow that suits living rooms and bedrooms. Neutral white, around 3500K to 4000K, feels clean and works well in kitchens and bathrooms. Cooler light, around 5000K, is crisp and suits workspaces and garages. Many rooms mix several lamps, so keep similar color temperatures in the same space to avoid a patchy look.
Steps for Replacing a Bulb
- Switch the lamp off and let the old bulb cool.
- Note the base type and shape marked on the old bulb or fixture.
- Check the maximum wattage on the fixture label.
- Match lumens to the brightness you had, not the watts.
- Choose the color temperature and confirm it is dimmable if needed.
- Twist the new bulb in until snug without forcing it.
Common shapes also appear on packages. A-shape bulbs fit standard lamps, globe bulbs suit bathroom vanity bars, candle shapes go in chandeliers and wall lights, and reflector bulbs aim light downward from recessed ceiling fixtures. Base codes such as E26 or E12 describe the screw fitting, so check the old bulb or the lamp label before you buy.
Color rendering is another detail on some packages. A higher figure means colors look more natural under the bulb, which matters near mirrors or where you choose clothing. Keep spare bulbs in a dry cupboard in their boxes, and dispose of old ones as local guidance directs.
FAQ
Why does my LED flicker on a dimmer?
The dimmer may not be compatible. Check the bulb and dimmer notes from the makers.
Can I use an LED in an enclosed fixture?
Only if the package says it is suitable. Enclosed spaces can trap heat.
The Short Version
Match the base, compare lumens instead of watts, and choose a color temperature for the mood of the room. Stay within the fixture’s limits.