How Many Downlights Do I Need?

Calculate the perfect number of downlights for any room. Get the right brightness, optimal spacing, and recommended layout for professional results.

Correct Lux Levels
Optimal Spacing
Visual Layout

Room Details

Room Type Presets
Room Dimensions
m
m
m
Room area: 12.0 m²
Lighting Requirements
lux
Dim (100) Ambient (300) Task (500) Bright (750+)
Task lighting – ideal for kitchens & offices
Downlight Specification
lm
Typical: 400-1200 lm
W
⚙️ Advanced Settings
Accounts for light loss over time
Wall/floor reflectance
m
Typically half the spacing between lights

Your Results

Downlights Needed
6
2 rows × 3 columns
4,800
Total Lumens
500
Achieved Lux
48W
Total Power
4.0
W/m² (Efficiency)
Room Layout Preview
4.0m × 3.0m
Recommended Spacing
1.33m
Between lights (length)
1.50m
Between lights (width)
0.60m
From walls
Room Area12.0 m²
Required Lumens6,000 lm
Lumens per m²500 lm/m²
Downlights × Lumens6 × 800 lm = 4,800 lm
Pro Tips
  • Keep lights at least 60cm from walls to avoid harsh shadows
  • Space lights evenly in a grid pattern for uniform coverage
  • Use dimmable LEDs for flexibility in different situations
  • Consider 4000K colour temperature for kitchens & bathrooms
LED Efficiency 100+ lumens per watt
Beam Coverage 60° for general lighting

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