Tool
Light Meter
Estimate total lumens and the number of fixtures based on room type and floor area.
Room details
All measurements in meters
Lighting plan
Target: 200 lux for living room
- Floor area
- 20.0 m²
- Recommended illuminance
- 200 lux
Total light output needed
4,000 lm
≈ 50 W LED (80 lm/W)
Fixtures
5×
800 lm each ( ≈ 10 W LED)
Values follow common residential guidelines. Kitchens and offices often need layered lighting — add task lamps where you read or work.
About the light meter
How much light does a room need?
This calculator uses recommended lux levels for residential spaces and multiplies by floor area to get total lumens needed.
Kitchens and offices need more light than bedrooms or hallways.
Frequently asked questions
- What is lux?
- Lux measures illuminance — lumens per square meter on a surface.