Colour Temperature Selector: Find the Best LED Light Colour for Every Room

Colour temperature is the colour of the white a bulb gives out, from warm and golden to crisp and bluish. It changes how a room feels more than almost anything else about a light, and it’s hard to judge from a number on a box.

The selector below shows the same room at different colour temperatures, so you can see the difference before you buy.

How to use the selector

1. Pick a room: living room, bedroom, kitchen, office or outdoor.
2. Move the slider through 2200K, 3000K, 4000K, 5000K, 6000K and 6500K and watch the room change.
3. Drag the brightness slider down to see how the room looks dimmed.
4. Read the note under the picture, which says how that colour suits the room.
5. Write down the kelvin (K) value you like, and look for that number on the bulb or fitting’s box.

It’s a guide, not a match for a real bulb. Screens vary, and the same bulb looks different on white walls, oak, dark paint and in daylight. If you’re torn between two values, buy one bulb of each and try them in the room in the evening.

What colour temperature means

Colour temperature is measured in kelvin (K). Lower numbers give warmer, more yellow light; higher numbers give cooler, whiter light. It has nothing to do with brightness, which is measured in lumens: a 2700K bulb and a 6500K bulb can give exactly the same amount of light. The lumens guide covers how bright each room should be.

The selector also goes down to 2200K, which is warmer still: close to candlelight or a dimmed filament bulb. It’s lovely for bedside lamps and garden lighting in the evening, but too dim and orange for anything practical. For more on the science and how to read a bulb box, see what colour temperature means.

Warm white (2700K to 3000K)

Warm white is the right choice for most of a UK home. It’s close to the colour of old incandescent bulbs, which is why it feels natural in the evening, and it flatters wood, fabrics and skin.

Use 2700K in living rooms, bedrooms and anywhere you want it cosy, and 3000K where you want warmth with a bit more clarity: hallways, dining areas, and most kitchens. Warm white is also the usual choice for garden and patio lighting.

Neutral white (around 4000K)

Neutral white looks clean and bright without a yellow tint. It suits rooms where seeing clearly matters more than atmosphere: bathrooms (especially around the mirror), utility rooms, and kitchens used mainly for cooking.

For kitchens, the selector suggests 4000K, which gives the crispest working light. In a kitchen you also eat and sit in, I’d usually pick 3000K instead and add good under-cabinet lighting; it keeps the room warm in the evening without losing clarity on the worktops. The kitchen colour temperature guide goes through both options.

Cool white and daylight (5000K+)

Cool white and daylight bulbs give crisp, bluish light that helps with detailed work and makes spaces look very bright. At home that means garages, workshops and security lights, and possibly a home office if you work long hours. In living rooms and bedrooms it feels harsh, and in the evening it can make it harder to wind down.

Best colour temperature by room

These match the settings in the downlight spacing calculator, so you can plan the layout and the colour together.

Mistakes to avoid

The most common one is mixing colour temperatures in the same room, such as 3000K downlights next to 4000K under-cabinet strips. Each looks fine on its own; together they make the room look patchy. Pick one for each room, or each zone of an open-plan room, and check the K number on every bulb and strip before it goes in.

The second is choosing “daylight” bulbs because you think they’ll be brighter. They look brighter at first, but brightness comes from lumens. If a room feels dim, buy bulbs with more lumens at the colour temperature you want.

The third is ignoring colour rendering. Two 3000K bulbs can make food, skin and paint look quite different, depending on their CRI. Look for CRI 90 or above in kitchens and bathrooms; CRI vs colour temperature explains the difference.

Dimming and adjustable white

The selector’s brightness slider shows a room getting darker while keeping its colour, and that’s how most LED bulbs behave. Old halogen and filament bulbs got warmer as they dimmed, which is why they felt so cosy at low light. If you want that effect, look for “warm dim” bulbs, such as Philips WarmGlow, which get warmer as you turn them down.

If you can’t decide, or want cooler light for working and warmer for evenings, smart bulbs with adjustable white let you change the colour temperature from an app or a switch. They cost more than standard bulbs, but in a kitchen-diner or home office they solve the problem. Our guide to the best LED bulbs covers the options.

What I'd buy

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Warm white GU10Philips CorePro LED GU10, 3000K4.6 W, 390 lm, dimmable, consistent colour from bulb to bulb. About £3–£5.Warm dimPhilips WarmGlow LED bulbGets warmer as it dims, like an old filament bulb. E27 and E14 versions. About £5–£10.Adjustable whitePhilips Hue White AmbianceAdjustable from 2200K to 6500K, app and voice control. About £25–£35 a bulb; works best with a Hue Bridge.Adjustable white, cheaperWiZ tunable white bulbWarm to cool white over Wi-Fi, no hub needed. About £8–£15.

FAQs

What is the best colour temperature for home lighting?

2700K to 3000K warm white for most rooms, 3000K to 4000K for bathrooms, and 3000K for most kitchens. Keep cooler light for garages, workshops and security lights.

Is 4000K too bright for a house?

4000K isn’t brighter; it’s a cooler colour. It works well in bathrooms and utility rooms, but in a living room or bedroom it can feel less relaxing than warm white.

Can I mix colour temperatures in one house?

Yes. Different rooms can have different colour temperatures. Just avoid mixing them within one room, or within one zone of an open-plan space.

Are daylight bulbs good for a kitchen?

Not usually. 6500K makes a home kitchen feel clinical, especially in the evening. 3000K, or 4000K for a kitchen that’s purely a workspace, is a better choice.

What colour temperature is warm white?

Warm white is 2700K to 3000K. Bulbs labelled “soft white” or “extra warm” are usually at the 2700K end, but check the K number on the box rather than the name.