LED lighting is one of the more straightforward home efficiency upgrades, but good light is about more than watts. Brightness, colour, fixture design and controls all affect the result.
Compare lumens, not just watts
Lumens describe light output; watts describe electrical power. When replacing a bulb, start with the brightness you like and then compare the wattage of models producing similar lumens.
For an illustrative comparison, an 800-lumen LED drawing 9 watts uses 9 kilowatt-hours over 1,000 hours, while a 60-watt incandescent uses 60 kilowatt-hours over the same period. The difference is 51 kWh; multiply by your local electricity rate to estimate operating-cost savings. Actual product wattages vary.
Choose colour temperature for the room
Colour temperature is measured in kelvins (K). Lower values such as 2700 K tend to look warm and inviting; 4000 K is more neutral; higher values such as 5000 K can look cooler. Preferences differ, so consider testing one bulb before changing an entire room.
Colour rendering also matters: compare the colour rendering index (CRI) or other available colour-quality information, particularly for kitchens, workspaces and areas where accurate colour perception is useful.
Check the fixture before ordering
Not every LED bulb is rated for fully enclosed fixtures, outdoor damp conditions or dimmer switches. A mismatch can lead to flickering, poor dimming or reduced lifespan. Read both the lamp and fixture instructions.
Confirm base type, bulb shape, physical clearance and whether the light is directional. For recessed lighting, check the specific retrofit and fixture requirements rather than relying only on matching socket size.
Lifespan and total cost
Long advertised lifetimes are usually based on standardized test assumptions, not a promise that every bulb will last that long. Heat, electronics, switching patterns and fixture ventilation can influence real-world performance.
Consider warranty terms, availability of replacements and whether a failed integrated LED fixture requires replacing the whole assembly. For frequently used lamps, efficiency may matter more than for lights switched on only occasionally.
A sensible replacement plan
Prioritize frequently used incandescent or halogen bulbs, then replace other bulbs as they fail. Working efficient LEDs rarely need replacing solely to gain a small incremental efficiency improvement.
- Match the lumens you need.
- Pick an appropriate colour temperature.
- Verify dimmer and enclosed-fixture compatibility.
- Compare certified efficiency information, warranty and cost.
- Recycle spent bulbs through suitable local programs when available.
Brightness and annual cost reference
Approximate starting points for bulb shopping are 450 lumens for a traditional 40-watt equivalent, 800 for 60-watt, 1,100 for 75-watt and 1,600 for 100-watt. Check beam angle, colour quality and fixture restrictions rather than treating these as exact matches.
At three hours per day, a 9-watt LED uses about 9.86 kWh yearly versus 65.7 kWh for a 60-watt incandescent. At an illustrative CAD $0.15/kWh, that is about CAD $8.38 saved annually per bulb, excluding purchase cost.
Sources and further reading
These official resources informed this guide. Check them for updates and specific product details.
For readers in Canada and the US
Efficiency programs, certifications, product availability, electrical or plumbing rules and rebates can vary by jurisdiction. Confirm the requirements and claims for the exact product and location before purchasing.