Color temperature: which Kelvin to use in each room
Updated
Color temperature, measured in Kelvin (K), tells you whether light looks yellowish or bluish. The lower the number, the warmer (yellower) the light; the higher, the cooler (bluish white). It does not change how much light a bulb gives, only the mood it creates.
The scale in practice
| Kelvin | What it looks like | Where it usually works |
|---|---|---|
| 2200K–2700K | Warm, like an incandescent bulb or candle | Bedroom, living room at night, accent lamps |
| 3000K | Soft warm, less yellow | Living room, dining room, open kitchen, bathroom |
| 4000K | Neutral white | Kitchen, home office, bathroom, laundry |
| 5000K | Daylight white | Laundry, garage, workshop |
| 6500K | Cool, bluish white | Garage, storage; at home it often feels like a hospital |
Color temperature by room
| Room | Color temperature |
|---|---|
| Living room Warm white (2700K–3000K) keeps the living room cozy at night. | 2700K to 3000K |
| Bedroom Warm white (2700K–3000K) is the most comfortable before sleep. | 2700K to 3000K |
| Kitchen Neutral white (4000K) shows food colors well; 3000K if the kitchen is open to the living room. | 3000K to 4000K |
| Bathroom 3000K–4000K, with CRI 80 or higher so skin looks right in the mirror. | 3000K to 4000K |
| Home office Neutral white (4000K) helps focus without the harshness of 6500K. | 4000K |
| Dining room Warm white (2700K–3000K) makes food look more appetizing. | 2700K to 3000K |
| Hallway Match the adjoining rooms, usually 2700K–3000K. | 2700K to 3000K |
| Laundry room 4000K–5000K helps spot stains and tell clothing colors apart. | 4000K to 5000K |
Tips
- Open-plan spaces need one color temperature. A living room and kitchen with 2700K on one side and 6500K on the other look like two different places.
- Check the CRI too (color rendering index). CRI 80 is the minimum for homes; 90 or higher shows skin, food and fabrics more faithfully.
- Cool light is not "brighter". A 6500K bulb looks crisper, but lumens are what define how much light it gives.
- Tunable white bulbs solve mixed-use rooms, such as a bedroom that doubles as an office.
Read this before you buy
These numbers are an estimate for planning and comparing, not a lighting design. The math accounts for wall color, light loss over time and an average LED efficacy (95 lm/W), but it does not know which fixture you will use, its beam angle or where the furniture is.
- In the store, compare lumens on the box, not watts. Efficacy ranges from 80 to over 110 lm/W.
- Closed fixtures, frosted diffusers and dark shades deliver less light than the bare bulb.
- When in doubt, aim for the middle of the range and add a dimmer: you can turn light down, not up.
- For construction, major renovations or commercial spaces, talk to a lighting designer, architect or electrician.
Where the values come from
The math follows the lumen method in the IES Lighting Handbook (Illuminating Engineering Society) and CIE 52 on utilization factors. The lux ranges are comfort references for homes, based on ANSI/IES RP-11 (residential lighting), ISO/CIE 8995-1 / EN 12464-1 and the residential values of the former Brazilian standard NBR 5413. Workplace lighting standards do not regulate homes; treat the values as a starting point.
- The Lighting Handbook, 10th ed. (2011)
Illuminating Engineering Society (IES) · Lumen (zonal cavity) method, room index and coefficient of utilization. - CIE 52:1982 — Calculations for interior lighting: applied method
Commission Internationale de l’Éclairage (CIE) · Utilization factor from the room index and surface reflectances. - ANSI/IES/ALA RP-11-26 — Lighting for Interior and Exterior Residential Environments
IES / American Lighting Association · Recommended practice for home lighting: lux levels per room and task. - ABNT NBR ISO/CIE 8995-1:2013 — Iluminação de ambientes de trabalho, Parte 1: Interior
ABNT (Brasil) · ISO/CIE 8995-1 · Current Brazilian/ISO standard for indoor illuminance; basis for home office and circulation areas. - EN 12464-1:2021 — Light and lighting: Lighting of work places, Part 1: Indoor
CEN (Europa) · European counterpart, same concept of maintained average illuminance. - ABNT NBR 5413:1992 — Iluminância de interiores (cancelada em 2013)
ABNT (Brasil) · Replaced by NBR ISO/CIE 8995-1; still the most quoted residential lux reference in Brazil.
Frequently asked questions
Warm or cool white: which is better?
It depends on the use. Warm light (2700K–3000K) is better for relaxing: living room, bedroom, dining room. Neutral white (4000K) is better for tasks: kitchen, home office, bathroom. Cool light (6500K) is rarely the best choice inside a home.
3000K or 4000K in the kitchen?
4000K if the kitchen is closed off and you want to see food colors clearly. 3000K if it is open to the living room, so the whole space keeps one color temperature.