Are LED bulbs worth replacing now? Work out the savings room by room

US & Canada · Cost examples use USD unless explicitly labeled CAD.

Inventory the lights you actually use

List the main rooms and note the bulb type, wattage and typical daily use. Prioritize the lights that stay on longest. An inefficient bulb used briefly in a cupboard offers less opportunity than one lighting a kitchen every evening.

Separate failed bulbs that already need replacing from working bulbs you are considering replacing early. The upfront decision is different for each group. Do not assume that every existing bulb is incandescent; many homes already have efficient lighting.

Match brightness and the fitting

Use lumens to compare light output, then check the base, physical dimensions and fixture requirements. Choose a color appearance that suits the room and consider whether you want consistent lighting across adjacent spaces. Wattage describes power, not an interchangeable brightness level across technologies.

Check compatibility with dimmers, enclosed fixtures and damp or outdoor locations where applicable. Follow the lamp and fixture instructions. A bulb that flickers or is unsuitable for its enclosure is not a good purchase simply because its energy rating looks attractive.

Calculate the annual difference

Subtract the proposed bulb’s watts from the old bulb’s watts, divide by 1,000 and multiply by annual operating hours. Then multiply the resulting kWh by your applicable electricity price. South Carolina’s Energy Saver guidance identifies LEDs as an efficient lighting option that uses less energy than traditional incandescent bulbs.

For illustration, replacing a 60-watt bulb with a suitable 9-watt LED saves 51 watts while operating. At three hours daily, that is about 55.8 kWh annually. At a hypothetical US$0.20 per kWh, the energy-charge difference is about US$11.17 per year. These assumptions are examples, not a savings promise.

For a Canadian example, the same 55.8 kWh reduction at an illustrative CAD 0.15/kWh is about CAD 8.37 annually. This uses a separate assumed Canadian rate; it is not the US result converted into CAD. Use the rate on your bill for your own calculation.

Buy in stages when preferences are uncertain

Try a suitable bulb in the room before buying a large pack. Check brightness, glare and dimming behavior under the conditions in which you use it. Keep the packaging until you are comfortable with the result and understand the return terms.

If your current bulb is already a 10-watt LED, moving to a 9-watt model provides only a one-watt difference. The same calculation will show why replacing a working efficient bulb solely to save electricity may have a long payback.

Keep controls simple

Turn unnecessary lights off and use timers or sensors only where they solve a real problem. Include the price and any standby use of smart controls in a more complete comparison. Automation that repeatedly switches on an unneeded light can undermine the point of the upgrade.

Record which bulbs work well with your fixtures for future replacements. Use local disposal guidance for the old bulb type, particularly fluorescent lamps. A staged, compatibility-first approach helps you spend on the rooms where the improvement will be most noticeable.