1. What is Lumens per Square Foot?

Lumens per square foot (lm/sq ft) is a measurement of illuminance that indicates how much light is distributed over a surface area. It's particularly important for countertop lighting to ensure proper visibility for food preparation and other tasks.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• Total Lumens — The combined light output of all light sources (measured in lumens)
• Area — The surface area being illuminated (measured in square feet)

Explanation: This calculation helps determine if your lighting setup provides adequate illumination for countertop tasks.

3. Importance of Lighting Calculation

Details: Proper countertop lighting typically requires 50-100 lumens per square foot for general tasks, and up to 300 lumens per square foot for detailed work like food preparation.

4. Using the Calculator

Tips: Enter the total lumen output of your lighting fixtures and the area of your countertop in square feet. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How many lumens per square foot do I need for kitchen countertops?
A: For kitchen countertops, 75-100 lumens per square foot is recommended for general use, while 200-300 lumens per square foot is better for food preparation areas.

Q2: What's the difference between lumens and lux?
A: Lumens measure total light output, while lux measures lumens per square meter. 1 lux = 0.0929 lumens per square foot.

Q3: Should I include under-cabinet lighting in my calculation?
A: Yes, include all light sources that illuminate the countertop surface in your total lumens calculation.

Q4: How do I find the lumens of my light bulbs?
A: Check the packaging or manufacturer specifications. LED bulbs typically list lumens prominently.

Q5: Does countertop material affect lighting needs?
A: Yes, darker surfaces may require more lumens than lighter ones to achieve the same perceived brightness.