Does a higher Kelvin number mean a brighter bulb?

No. Kelvin describes the colour of the light — warm and yellow at low numbers, cool and blue-white at high numbers. Brightness is measured separately in lumens.

Is daylight (6500K) bad?

Not bad, just wrong for the wrong room. Daylight bulbs are crisp and energising, which suits garages, security lights and detailed tasks. In bedrooms and living rooms they can feel cold and clinical.

What colour temperature is best for a home?

For most living spaces, 2700K to 3000K warm white feels the most comfortable and homely. Kitchens and bathrooms often suit a slightly cooler 3000K to 4000K for clearer task light.

Last updated: 19 August 2026

Warm white vs cool white vs daylight

Colour temperature is the "mood" of a bulb — whether it glows warm and yellow or crisp and blue-white. It is measured in Kelvin (K), and getting it wrong is the single most common reason a new LED "looks off".

What Kelvin means

Colour temperature runs on a scale measured in Kelvin. The lower the number, the warmer and yellower the light; the higher the number, the cooler and bluer it looks. It is slightly counterintuitive: a "warm" bulb has a lower number, and a "cool" bulb a higher one. Kelvin says nothing about brightness — that is lumens.

The three bands

Bulbs generally fall into three groups:

Warm white (2200–3000K) — cosy, homely, yellow-toned. The traditional household glow.
Neutral / cool white (3500–4500K) — cleaner and more functional, without being harsh.
Daylight (5000–6500K) — crisp, bright, blue-white and energising.

Which room suits which

Room	Suggested colour
Bedroom, living room	2700K warm white
Dining room, lamps	2700–3000K warm white
Kitchen, bathroom	3000–4000K warm to neutral
Home office, garage	4000–5000K neutral to cool
Security, utility spaces	5000–6500K daylight

Why daylight can feel harsh

Daylight bulbs are not "bad" — they are simply designed for alertness and detail, not relaxation. Put a 6500K daylight bulb in a bedroom or living room and it can feel cold, clinical and unwelcoming, a bit like a hospital corridor. Reserve the cool, blue-white end of the scale for garages, workshops, security lights and close-up tasks. If a bulb ever feels harsh, colour temperature is usually the culprit — though sometimes it is glare or low colour rendering instead. Our Fix My Bad Bulb tool can tell the difference.

What to buy

For most homes, 2700K to 3000K warm white is the safe, comfortable choice. Step up to 3000–4000K in kitchens and bathrooms where you want clearer task light, and only go to daylight in genuinely functional spaces.