Updated July 2026.
Light temperature is measured in kelvins: the lower the number, the warmer the light. Choose a warm white of 2700 kelvins for the living room, bedroom, and dining room, and a neutral white of 3500 to 4000 kelvins for the kitchen, bathroom, and office.
What is light temperature?
It is measured in kelvins (K) and indicates whether a light tends towards warm (golden) or cool (bluish). Counterintuitively, the lower the number, the warmer the light. A candle emits about 1800 kelvins, an office light about 4000 kelvins, and a gray sky more than 6000 kelvins. The art is to match the temperature to the room's use. This is another building block of the principle explained in our guide on how to properly light each room.
The temperature chart, room by room
The simplest guide, to keep handy before buying your bulbs:
| Room | Temperature | Ambiance |
|---|---|---|
| Living Room | 2700 K | Warm, conducive to relaxation |
| Bedroom | 2700 K | Soft, prepares for rest |
| Dining Room | 2700 to 3000 K | Friendly, enhances dishes |
| Kitchen, countertop | 3000 to 4000 K | Clear, for cooking |
| Bathroom | 3000 to 4000 K | Precise, for getting ready |
| Office, reading nook | 3500 to 4000 K | Neutral, supports concentration |
| Garage, laundry room | 5000 K and above | Technical, for judging colors |
Warm white (2700 to 3000 K): for living and resting
This is the reigning temperature in the home. Living room, bedroom, dining room, entrance: wherever you want to feel good, warm white around 2700 kelvins creates an enveloping and flattering atmosphere, for faces as well as materials. When in doubt, it's almost always the right choice.
Neutral white (3500 to 4000 K): for functional rooms
In a kitchen, bathroom, or on a countertop, you need to see clearly and precisely. Neutral white around 4000 kelvins, more invigorating, is perfectly suited for these activity areas without becoming clinically cold. The trick: in an open kitchen, combine neutral white on the countertop and warm white in the dining area, as explained for lighting a kitchen.
Cool white (5000 K and above): to be reserved
Beyond 5000 kelvins, the light becomes distinctly bluish. Avoid it in living areas, where it kills all warmth. Reserve it for highly technical spaces, such as a garage, laundry room, or dressing room where colors need to be judged precisely.
The golden rule: consistency
The mistake to absolutely avoid is mixing different temperatures in the same room: a golden lamp next to a bluish lamp, and the eye is lost. Choose a dominant temperature per room and stick to it for all your light sources. Even a beautiful table lamp fails its effect with the wrong bulb.
Fenalor's tip: When purchasing, look for the kelvins mention on the bulb's box, not just the watts. Watts indicate consumption, kelvins indicate the color of the light, which sets the ambiance.
The color rendering index: the criterion we forget
Kelvins tell us the color of the light, CRI tells us its fidelity. The color rendering index, noted CRI or Ra, ranges from 0 to 100: 100 corresponds to daylight, which renders all shades without distorting them. European regulations require a CRI of at least 80 for most domestic bulbs, which remains an acceptable minimum for a hallway, garage, or laundry room. Aim for 90 and above wherever colors truly matter: a dressing room where you match your clothes, a bathroom where you get ready, a countertop where you judge cooking, a reading nook. The difference is immediately visible: under a CRI of 80, a red turns brownish and a warm wood appears dull. So look for the CRI or Ra mention on the box, right next to the kelvins.
Matching the temperature to your colors and materials
The same paint looks completely different under 2700 and 4000 kelvins. Warm light saturates warm tones and mutes cool ones: a beige, terracotta, oak, or brass gains depth, while a pale blue or sage green turns grey. Neutral light does the opposite: it keeps whites truly white and restores freshness to cool tones, but it hardens woods and dulls gilding. The right approach is therefore to first choose your palette, then the temperature that best serves it. In a predominantly warm room, stick to 2700 kelvins; in a very white or bluish interior, go up to 3000 kelvins to avoid a yellowed effect. Always test a bulb before buying six. To build the palette itself, see how to combine colors and materials in a living room, then browse our lighting fixtures.
Frequently Asked Questions
What light temperature for a living room?
A warm white around 2700 kelvins, the most relaxing in a living space. It leans towards golden, flatters materials, and creates an enveloping atmosphere in the evening. Reserve more neutral whites for an office or reading nook that requires concentration.
What is the difference between 2700 K and 4000 K?
2700 kelvins give a warm, golden light, ideal for relaxation. 4000 kelvins give a neutral white, more invigorating, which helps to see clearly. The former is suitable for living areas, the latter for functional areas like the kitchen or bathroom.
Does more kelvins mean warmer light?
No, it's the opposite. The higher the Kelvin number, the cooler and bluer the light. A warm, golden light corresponds to a low number, around 2700 kelvins. This is the most often misunderstood point.
Can different temperatures be mixed?
In the same room, it's better to have a consistent dominant temperature across all sources. However, you can differentiate two areas in an open space, for example, a neutral white on the worktop and a warm white in the dining area.
To equip each room, browse the entire lighting collection from Fenalor.
To choose the light source itself, our guide to ceiling lights, including IP rating.
