Two lamps can use the same amount of power and still make a room feel completely different. The reason is colour temperature - how warm (yellow) or cool (blue) the light looks. Get it right and a room feels relaxing or bright and focused. Get it wrong and a cosy living room can feel like an office.
Quick answer
Use warm white (2700-3000K) in living rooms, bedrooms and dining rooms. Use natural white (4000K) in kitchens, bathrooms and home offices. Save cool white (5000-6500K) for garages, utility rooms and close-up tasks.
What do the Kelvin numbers mean?
Light colour is measured in Kelvin (K). The lower the number, the warmer and more golden the light:
- 2700K - warm white: soft and golden, close to an old-style filament bulb. Cosy and relaxing.
- 3000K - warm white: slightly crisper but still warm. A good all-rounder for living spaces.
- 4000K - natural or neutral white: clean and bright without feeling cold. Good for seeing detail.
- 5000-6500K - cool white or daylight: bright and blue-tinted. Very clear, but can feel clinical at home.
The best light colour for each room
- Living room: 2700-3000K. Layer a ceiling light with floor and table lamps so you can switch to softer light in the evening.
- Bedroom: 2700K. Warm light at night helps you wind down; a bedside lamp is more useful than a bright ceiling light.
- Dining room: 2700-3000K. Food and faces look their best in warm light, and a dimmable fitting lets you set the mood.
- Kitchen: 3000-4000K. Brighter, cleaner light helps with chopping and cooking, especially over worktops and islands.
- Bathroom: 3000-4000K. Natural white around the mirror shows true colours for shaving and make-up.
- Home office or study: 4000K. Helps you stay alert and reduces eye strain while you work.
- Hallway: 3000K. Warm and welcoming without being dim.
Brightness is a different thing: lumens
Colour temperature tells you what colour the light is; lumens tell you how bright it is. With LED bulbs, watts no longer tell you much. As a guide:
- About 470 lumens is similar to an old 40 W bulb.
- About 806 lumens is similar to an old 60 W bulb.
- About 1,521 lumens is similar to an old 100 W bulb.
If colours matter to you (art, make-up, a kitchen), look for a CRI of 90 or above on the bulb. CRI measures how true colours look under the light.
Can't decide? Choose a light with three colours
Many of our lights let you switch between warm, natural and cool white, so one fitting works for every time of day:
- Macaron Glass Table Lamp - three light colours on one switch.
- Nordic Pleated Fabric Table Lamp - a warm bedside lamp with three light colours.
- Isla Floor Lamp with Side Table - three-colour bulb included, plus a built-in table.
- Seren Crystal Floor Lamp - touch dimming with warm, natural and cool white.
- Nordic Mushroom LED Floor Lamp - stepless dimming and three light colours.
- Aurelia Crystal Flush Mount Ceiling Light - three light colours switched from the wall.
Frequently asked questions
Is warm white or cool white better for a living room?
Warm white (2700-3000K) is best for living rooms. It feels relaxing and flatters wood, fabrics and skin tones.
What colour light is best for a kitchen?
Between 3000K and 4000K. Natural white (4000K) over worktops makes it easier to see what you're doing.
Is daylight bulb (6500K) good for the home?
It's useful in garages, utility rooms and for close-up tasks, but most people find it too harsh for living rooms and bedrooms.
What does 3000K mean on a bulb?
It's the colour temperature. 3000K is warm white - slightly crisper than a traditional bulb but still cosy.
Need help choosing? Email our UK team at contact@jfhabrightnest.com and we'll point you to the right light. Every order comes with free UK delivery and 30-day returns.