Light Fixture Calculator — Calculate Lighting Requirements & Costs

Light Fixture Calculator

Calculate lighting requirements for any space. Determine the number of light fixtures needed, energy costs, and compare different lighting technologies.

Step 1: Room Details

Understanding Lighting Requirements

Different rooms require different lighting levels (measured in lumens). Living spaces need 10-20 lumens per sq ft, while task areas like kitchens need 70-80 lumens per sq ft.

Step 2: Lighting Details

Watts
Lumens
per kWh

About Lighting Efficiency

Lumens measure light output, while watts measure energy consumption. LED fixtures provide more lumens per watt, making them more energy-efficient than incandescent or halogen bulbs.

Lighting Calculation Results

Summary
Fixture Comparison
Cost Breakdown

Total Lighting Requirements

8 Fixtures
Annual Energy Cost: $65.70
Room Area
300 sq ft
Required Lumens
4,500
Monthly Energy Cost
$5.48
Efficiency Rating
Good

Light Fixture Comparison

Fixture Type Wattage Lumens Fixtures Needed Annual Energy Cost

Energy Cost Breakdown

Lighting Calculation Formula

Fixtures Needed = (Room Area × Lumens per sq ft) ÷ Lumens per Fixture

The number of fixtures is calculated by determining the total lumens needed for the room based on its purpose, then dividing by the lumens output of each fixture.

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