9 Things to Know Before Buying Replacement Bulbs

1. Lumens rather than watts

Lumens measure light output; watts measure power consumed.

Efficiency varies between products, so two bulbs of the same wattage can differ in brightness.

Buy to the lumen figure appropriate for the room and use, and treat any equivalent-to-sixty-watt claim as approximate.

2. Colour temperature

Measured in kelvin. Lower numbers are warmer and yellower; higher are cooler and bluer.

Warm tones suit living rooms and bedrooms; neutral suits kitchens and workspaces; very cool light suits utility spaces and reads as clinical elsewhere.

Mixing temperatures within one room looks wrong, so buy a full set at once and keep a spare of the same specification.

3. Colour rendering

The colour rendering index describes how accurately colours appear under the light.

Low values make food, skin and fabrics look dull or wrong, which is a common complaint about cheap bulbs and rarely attributed to the correct cause.

It matters most in kitchens, bathrooms and anywhere colour is judged.

4. Dimming

Not all bulbs dim, and dimmable bulbs need a compatible dimmer.

Old dimmers designed for incandescent lamps commonly cause flicker or buzzing with modern bulbs.

Where dimming is wanted, replace the dimmer alongside the bulbs.

5. Lifespan and quality

Rated lifetimes are optimistic where heat is trapped in an enclosed fitting, which shortens life considerably.

Cheap bulbs frequently fail early through poor driver components rather than the diodes themselves.

Flicker is a real issue with low-quality drivers and causes headaches in sensitive people.

6. Practical approach

Replace failed bulbs with the correct lumen output rather than an assumed wattage.

Keep the packaging or photograph the specification, which saves guessing next time.

Fit brighter, higher-quality light where tasks happen and softer light where you relax.

7. Fittings and bases

Check the base type before buying — bayonet and screw fittings come in several sizes and are not interchangeable.

Check the maximum wattage the fitting permits, which still applies even though modern bulbs draw far less.

Enclosed fittings trap heat and shorten bulb life, so look for bulbs rated as suitable for enclosed use.

8. Layering light in a room

A single ceiling light produces flat, unflattering illumination and heavy shadows.

Combining a general source with task lighting where work happens and lower accent lighting elsewhere makes a room both more usable and more comfortable.

Several lower-output sources frequently feel brighter and better than one high-output fitting.

9. Disposal

Old fluorescent and compact fluorescent lamps contain mercury and must go to appropriate recycling rather than household waste.

Modern bulbs are electrical waste and are accepted at recycling points and many retailers.

Final Thoughts

Buying bulbs on wattage is a habit left over from a different technology. Buy to the lumen output, match colour temperature across a room, and pay attention to colour rendering anywhere you judge food, fabric or faces.