Lumens Per Square Foot Calculator:
Enter the values of total luminous flux emitted by the light source, TF(lm) and area, A(ft2) to determine the value Lumens Per Square Foot, LPSF.
Lumens Per Square Foot Formula:
Lumens per square foot (LPSF) is a measurement of the intensity of light in a given area, quantifying how much luminous flux (light) is received per square foot. It is a key concept in lighting design, helping to evaluate the brightness of an illuminated space. This measurement is widely used in commercial and residential settings to ensure adequate lighting.
The formula for LPSF considers the total luminous flux emitted by a light source and the area of the surface that receives the light. It is expressed in lumens (lm) per square foot (ft2), where 1 lumen is the amount of light emitted by a light source in one steradian of space.
The light intensity varies depending on factors such as the light source’s efficiency, distance from the illuminated surface, and the surface’s reflective properties. LPSF helps in determining whether a space is well-lit for its intended use, such as in offices, classrooms, or living rooms.
Lumens Per Square Foot, LPSF, divide the total luminous flux emitted by the light source, TF(lm) in lumens by the area, A(ft2) in square feet.
Lumens Per Square Foot, LPSF = TF(lm) / A(ft2)
LPSF = lumens per square foot.
TF(lm) = total luminous flux emitted by the light source in lumens, lm.
A(ft2) = area in square feet, ft2.
Lumens Per Square Foot Calculation:
- A room receives 5000 lumens from a light source, and the area of the room is 250 square feet. Calculate the LPSF.
Given: TF(lm) = 5000lumens, A(ft2) = 250ft2.
Lumens Per Square Foot, LPSF = TF(lm) / A(ft2)
LPSF = 5000 / 250
LPSF = 20lm/ft2.
- A light source emits 8000 lumens in a room with an LPSF of 30. Calculate the area of the room.
Given: TF(lm) = 8000lumens, LPSF = 30lm/ft2.
Lumens Per Square Foot, LPSF = TF(lm) / A(ft2)
A(ft2) = TF(lm) / LPSF
A(ft2) = 8000 / 30
A(ft2) = 266.67ft2.