Two lights can be equally bright yet feel completely different. The reason is colour temperature, measured in Kelvin (K). Understanding it is the simplest way to make a room feel cosy, fresh or focused.
What the numbers mean
| Colour temperature | Look and feel | Best for |
|---|---|---|
| 2700K | Warm, golden and cosy, close to a traditional bulb | Living rooms, bedrooms, dining rooms |
| 3000K | Warm white, soft yet slightly crisper | Kitchens, dining areas, hallways |
| 4000K–4500K | Neutral white, clear and natural | Kitchens, bathrooms, home offices |
| 6000K–6500K | Cool daylight white, bright and energising | Utility rooms, garages, workspaces |
The lower the number, the warmer and more relaxing the light. The higher the number, the cooler and more alert it feels.
Choosing room by room
- Living room and bedroom: stay warm, at 2700–3000K, for a welcoming, restful atmosphere.
- Kitchen: 3000K keeps it inviting; 4000K is ideal if you want clear light for cooking.
- Home office: neutral 4000K helps concentration without feeling clinical.
- Hallway: warm 3000K makes a lovely first impression.
Keep it consistent
Mixing very warm and very cool lights in the same room can look uneven. Choose one colour temperature per space, and if you love flexibility, look for lights with selectable or tunable colour temperature, often adjustable with a remote control.
Brightness is measured in lumens
With LED lighting, watts tell you how much energy a light uses, not how bright it is. Brightness is measured in lumens (lm). As a reference, around 800 lm is similar to a traditional 60W bulb, and around 1,500 lm is similar to a 100W bulb. For a main ceiling light, higher lumens are useful; for mood lighting, less is more.
Colour rendering (CRI)
CRI measures how naturally a light shows colours, on a scale up to 100. A CRI of 90 or above makes wood, fabrics and skin tones look rich and true, which is why it matters in living spaces and kitchens.
The essentials
2700–3000K for warmth in living spaces and bedrooms, 4000K for clarity in kitchens and offices, one colour temperature per room, and a CRI of 90+ for colours that look their best.
