How many lumens does a kitchen need?
Updated
The kitchen is where knives, fire and hot water meet, so it is where good light matters most for safety. The most common mistake is a single central light: at the counter, your own body casts a shadow right where you are cutting.
For a kitchen of 9 m² (3 × 3 m, about 97 sq ft) with light walls, plan on about 7,250 lumens, roughly 76 W of LED. The recommended range is 200 to 300 lux for general light and 300–500 lux on the counter.
Recommended lux for a kitchen
| Where | Illuminance | Color temperature |
|---|---|---|
| General room light | 200–300 lx | 3000K to 4000K |
| Countertop, sink and stove | 300–500 lx | 3000K to 4000K |
How many lumens by kitchen size
Total lumens to reach an average of 250 lux, adding up every bulb in the room. Watts are for regular LED bulbs (about 95 lm/W). 1 m² ≈ 10.8 sq ft.
| Area | Light walls | Mid-tone walls | Dark walls | LED (light walls) |
|---|---|---|---|---|
| 6 m² (65 sq ft) | 5,550 lm | 6,750 lm | 7,950 lm | ≈ 58 W |
| 9 m² (97 sq ft) | 7,300 lm | 8,600 lm | 10,100 lm | ≈ 77 W |
| 12 m² (129 sq ft) | 8,950 lm | 10,400 lm | 12,100 lm | ≈ 94 W |
| 15 m² (161 sq ft) | 10,500 lm | 12,150 lm | 13,950 lm | ≈ 111 W |
| 20 m² (215 sq ft) | 13,100 lm | 15,000 lm | 17,050 lm | ≈ 138 W |
Calculate for your room
Lighting tips
- Light the counter separately: an LED strip or profile under the wall cabinets removes the body shadow.
- Use 3000K–4000K. 4000K shows food colors more faithfully; 3000K blends better with open-plan kitchens.
- Near the stove, choose closed fixtures that are easy to clean, because of grease.
- In an open kitchen, split the circuits: bright task light, and a softer light for when the kitchen becomes part of the living area.
How the math works
Average illuminance (lux) is the light that reaches the work plane (table height, 0.75 m / 30 in), per square meter. Not all the light a bulb emits gets there: walls and ceiling absorb part of it, and LEDs lose output over time. The math follows the lumen method, the standard lighting design calculation:
lumens = lux × area ÷ (CU × MF)
- Room index (K): describes the room's shape. K = L × W ÷ [h × (L + W)], where h = ceiling height − 0.75 m. Small rooms and tall ceilings have a low K: more light hits the walls before reaching the table.
- Coefficient of utilization (CU): how much of the light reaches the work plane. It comes from a table that crosses K with wall reflectance (light ≈ 50%, mid-tone ≈ 30%, dark ≈ 10%), for a diffuse ceiling fixture and a white ceiling.
- Maintenance factor (MF): 0.8, to account for LED depreciation and dust.
Example: in a 3 × 3 m room with a 2.7 m ceiling (h = 1.95 m), K ≈ 0.77 and, with light walls, CU ≈ 0.39. For 250 lux: 250 × 9 m² ÷ (0.39 × 0.8) ≈ 7,250 lumens. Divided by 95 lm/W, that is about 76 W of LED.
The 3D simulator uses the same math, with the size and wall color you pick.
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
How many lux on a kitchen counter?
Between 300 and 500 lux on the work surface. To get there without overdoing the general light, add a dedicated light source above or under the cabinets, close to the counter.
Warm or cool light in the kitchen?
Neutral white (4000K) is the most common choice because it shows food colors well. If the kitchen opens to the living room, 3000K matches the rest of the home better.
How many LED watts for a kitchen of 9 m² (97 sq ft)?
About 76 W of LED across all bulbs, for 7,250 lumens (250 lux with light walls). Efficacy varies between brands, so check the lumens on the box: that is what tells you how much light the bulb gives.
What color temperature for a kitchen?
Neutral white (4000K) shows food colors well; 3000K if the kitchen is open to the living room. To compare in practice, the 3D simulator lets you change each bulb’s color temperature and see the effect in the room.