How many lumens does a laundry room need?
Updated
In the laundry room you need to spot stains and tell clothing colors apart. It is one of the few places in a home where whiter light (4000K–5000K) makes sense.
For a laundry room of 5 m² (2.5 × 2 m, about 54 sq ft) with light walls, plan on about 4,750 lumens, roughly 50 W of LED. The recommended range is 200 to 300 lux for general light and 300–500 lux at the sink and ironing board.
Recommended lux for a laundry room
| Where | Illuminance | Color temperature |
|---|---|---|
| General room light | 200–300 lx | 4000K to 5000K |
| Sink and ironing | 300–500 lx | 4000K to 5000K |
How many lumens by laundry room 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) |
|---|---|---|---|---|
| 3 m² (32 sq ft) | 2,850 lm | 3,450 lm | 4,100 lm | ≈ 30 W |
| 4 m² (43 sq ft) | 3,800 lm | 4,650 lm | 5,450 lm | ≈ 40 W |
| 5 m² (54 sq ft) | 4,750 lm | 5,800 lm | 6,800 lm | ≈ 50 W |
| 6 m² (65 sq ft) | 5,550 lm | 6,750 lm | 7,950 lm | ≈ 58 W |
| 8 m² (86 sq ft) | 6,750 lm | 8,050 lm | 9,400 lm | ≈ 71 W |
Calculate for your room
Lighting tips
- Use 4000K–5000K and high-CRI bulbs (80+) to see colors and stains.
- Put one light over the sink and another where you iron, not only in the center.
- Closed, damp-rated fixtures last longer near the sink and washing machine.
- In a narrow laundry area, a linear LED batten along its length works better than a round ceiling fixture.
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 2.5 × 2 m room with a 2.7 m ceiling (h = 1.95 m), K ≈ 0.57 and, with light walls, CU ≈ 0.33. For 250 lux: 250 × 5 m² ÷ (0.33 × 0.8) ≈ 4,750 lumens. Divided by 95 lm/W, that is about 50 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
What is the best light for a laundry room?
Neutral to cool white, 4000K–5000K, with CRI 80 or higher. It shows stains and clothing colors best.
How many lux for ironing?
Between 300 and 500 lux on the ironing board or table. A dedicated light above it usually does the job.
How many LED watts for a laundry room of 5 m² (54 sq ft)?
About 50 W of LED across all bulbs, for 4,750 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 laundry room?
4000K–5000K helps spot stains and tell clothing colors apart. To compare in practice, the 3D simulator lets you change each bulb’s color temperature and see the effect in the room.