Converting from Lumen per Square Foot (lm/ft²) to Lumen per Square Inch (lm/in²) | Illuminance

What is Lumen per Square Foot (lm/ft²)

Lumen per square foot (lm/ft²) is a unit of illuminance that measures the amount of light (lumens) falling on a surface area of one square foot. It is commonly used in lighting design to determine the brightness level in a given space.

What is Lumen per Square Inch (lm/in²)

Lumen per square inch (lm/in²) is another unit of illuminance that measures the light intensity per square inch of a surface. This unit provides a more localized measurement of light intensity for smaller areas.

Conversion Formulas

The default conversion factors between lm/ft² and lm/in² are as follows:

• 1 (lm/ft²) = 0.006944444 (lm/in²)
• 1 (lm/in²) = 144 (lm/ft²)

Additional conversion examples include:

• 11 (lm/ft²) = 0.07638889 (lm/in²)
  11×0.006944444=0.07638889

• 11 (lm/in²) = 1584 (lm/ft²)
  11×144=1584

• 16 (lm/ft²) = 0.1111111 (lm/in²)
  16×0.006944444=0.1111111

• 16 (lm/in²) = 2304 (lm/ft²)
  16×144=2304

• 15 (lm/ft²) = 0.1041667 (lm/in²)
  15×0.006944444=0.1041667

• 15 (lm/in²) = 2160 (lm/ft²)
  15×144=2160

These conversion formulas can be utilized to switch between the two units of illuminance for various lighting design calculations.