Swapping the old bulbs for LED ones is one of the simplest upgrades you can make to the lighting in your home. Choosing well is not only about the watts: the lumens, the color of the light and the compatibility with the fixture all matter.
Why choose LED bulbs?
LED bulbs usually use less electricity than the old incandescent ones to produce a similar amount of light. They also tend to last much longer, although the real lifespan depends on the product and on how it is used.
To choose correctly, wattage is not enough: you also have to look at the brightness, the color of the light and the compatibility with the fixture.
1. Understand what the watts mean
The watts tell you the electrical power the bulb uses. They are not a direct measure of how much light it produces.
A low-wattage LED bulb can give you light very similar to that of an old bulb that used far more watts.
2. Look at the lumens
The lumens tell you how much light is emitted. If you are replacing an old bulb, compare the lumens of the new one with those of the bulb you had.
The right amount of light also depends on the size of the room, the height of the ceiling, the color of the walls and what you do in the space.
3. Pick the right color temperature
Color temperature is expressed in kelvin (K):
- Around 2700 K: warm light, common in living rooms and bedrooms.
- Between 3000 and 4000 K: a more neutral looking light, useful in different areas of the home.
- Above 4000 K: cooler light, which can suit certain tasks or spaces.
These are general guidelines. Choose according to your own preferences and the purpose of each room.
4. Check the base and the compatibility
Before you buy a bulb, check the type of base, the dimensions and the maximum wattage the fixture allows.
If the bulb will be connected to a dimmer switch, make sure it is dimmable and compatible with that system.
5. Work out the electricity use
You can estimate the consumption by multiplying the power of the bulb in kilowatts by the hours it is on.
For example, an 8 W LED bulb that stays on for five hours uses:
8 W × 5 hours = 40 Wh, which is the same as 0.04 kWh.
To estimate the cost, multiply the kWh used by the price you pay for electricity. The result does not include the other charges on the bill.
6. Replace the lights you use most first
If you still have old bulbs, it may be worth starting with the ones that stay on for many hours a day.
Before you replace them, check what they consume, how you actually use them and what the new bulbs cost.
7. Do not forget to switch off the lights you do not need
LED bulbs use relatively little, but turning off the lights you do not need is still a simple way to cut your consumption.
You can also make the most of daylight and use local lighting for specific tasks.
Conclusion
To choose an LED bulb, compare the lumens, the wattage, the color temperature, the base and the compatibility. The real consumption depends on the power and on how long the bulb is on, so the bulbs you use most are usually the first ones worth reviewing.
Lighting is only one part of the bill: our guide to 10 tips to save money on electricity at home spreads the savings across heating, appliances and everyday habits, and how to understand your electricity bill step by step shows you how to check where your money goes. Heating is usually the most expensive part: what temperature to set the heating to save money explains how to adjust it.
The ENERGY STAR light bulb purchasing guide has a useful chart to convert the old incandescent wattage into the lumens you need.
