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How to Calculate Lighting Requirements

  1. Determine Room Dimensions
    Measure the room’s length, width, and height to calculate the total area or volume.
  2. Set the Desired Brightness Level
    Based on the purpose of the room:
    • Living rooms: ~10–20 lumens per square foot
    • Kitchens: ~30–40 lumens per square foot
    • Workspaces: ~50+ lumens per square foot
  3. Calculate Light Output
    Multiply the area by the recommended lumens per square foot.
  4. Choose Suitable Light Fixtures
    Match the total lumens needed with the number and type of light fixtures, considering the wattage and energy efficiency of each bulb.

Example:

Imagine you have a living room measuring 15 ft by 12 ft:

  1. Calculate the area:
    15 \, \text{ft} \times 12 \, \text{ft} = 180 \, \text{sq ft}.
  2. Select the brightness level for a living room (~15 lumens/sq ft):
    180 \, \text{sq ft} \times 15 \, \text{lumens/sq ft} = 2700 \, \text{lumens}.
  3. Choose light fixtures:
    If each bulb emits 900 lumens, you’ll need:
    \frac{2700 \, \text{lumens}}{900 \, \text{lumens/bulb}} = 3 \, \text{bulbs}.

With this tool, you can tailor your lighting design to suit your specific needs, ensuring optimal brightness and energy efficiency.

Transform your space with precise and practical lighting plans using our Lighting Calculator!