Lighting Design Calculator

Calculate the ideal number of light fixtures needed for your space based on its dimensions, type, and desired brightness level.

sq ft
lx
bulbs

How to Calculate Lighting Design

Formula:
The number of light fixtures is determined using:

\text{Number of Fixtures} = \frac{\text{Lux Level} \times \text{Room Area (sq ft)}}{\text{Bulb Brightness (lumens)}}

Where:

  • Lux Level: The recommended illumination level for the room type (e.g., living room, kitchen).
  • Room Area: Length × Width of the room in square feet.
  • Bulb Brightness: The lumen output of the light bulb used.

Steps to calculate:

  1. Measure the length and width of your room.
  2. Select the room type to determine the recommended lux level.
  3. Enter the brightness (lumens) of the light bulb you plan to use.
  4. The calculator will display the required number of light fixtures.

Example: Lighting Calculation for a Living Room

  • Room dimensions: 15 ft × 12 ft
  • Room type: Living room (Lux Level: 200 lx)
  • Bulb brightness: 800 lumens

Calculation:

  1. Room area = 15 \times 12 = 180 \, \text{sq ft}
  2. Required lumens = 200 \times 180 = 36,000 \, \text{lumens}
  3. Number of bulbs = \frac{36,000}{800} = 45 \, \text{bulbs}

You will need 45 light bulbs of 800 lumens each to properly illuminate your living room.