Calculator lighting (lumens and lux)
Calculate how many lamps are needed for room lighting according to IEC 60364 standards. Enter area, room type, and ceiling height to get the number of lamps, lumens, and line power.
⚙️ Room parameters
📊 Result
🔌 Lighting Line
📋 Illuminance Standards by Room Type (IEC 60364)
| Room | Min, Lux | Rec, Lux |
|---|---|---|
| Living Room | 150 | 200 |
| Bedroom | 100 | 150 |
| Kitchen | 150 | 250 |
| Children's Room | 200 | 300 |
| Bathroom | 50 | 100 |
| Hallway / Entrance | 50 | 100 |
| Stairs | 50 | 100 |
| Wardrobe / Storage | 50 | 75 |
| Garage | 50 | 100 |
| Office / Study | 300 | 500 |
| Conference Room | 200 | 300 |
| Reception | 200 | 300 |
Room Illuminance Calculation Formula
Φ = E × S × k
where: Ф — required luminous flux (Lm), E — standard illuminance (Lux) per IEC 60364, S — room area (m²), k — ceiling height factor (1.0–2.0).
Example: bedroom 15 m², ceiling 2.7 m, LED lamps 9 W (810 Lm).
Φ = 150 Lux × 15 m² × 1.0 = 2250 Lm. Number of lamps = 2250 / 810 = 3 lamps (27 W total).
The lighting calculation is based on IEC 60364 standards, which define minimum and recommended illuminance for different types of rooms.
Number of lamps = required luminous flux / luminous flux of one lamp. Luminous flux of a lamp = power (W) × efficacy (Lm/W). LED lamps have the highest efficacy — 80–100 Lm/W compared to 12 Lm/W for incandescent lamps.
Wall color significantly affects perceived brightness: dark walls absorb up to 30% of light, so such rooms require more lamps. Ceiling height also increases lighting demand due to light flux scattering.
In addition to general lighting, consider local lighting (kitchen work surface, desk) — its standards are higher: 300–500 Lux. General room lighting and local lighting are connected to different switches but can be on the same circuit.
For lighting circuits, cable 1.5 mm² with a B10 circuit breaker is recommended. Even if the total power of LED lamps in a room is only 50–100 W, a separate circuit from the panel ensures reliability and ease of maintenance. Selection of circuit breaker and cable — in our circuit breaker selection calculator.