Let's assume you have a light source with different illuminance values in Lux (lx) and you want to calculate the equivalent luminous flux in Lumens (lm) for a specific area. Here's an example to demonstrate the conversion using a calculator: Lumens (lm) = Lux (lx) × Area (in square meters) To convert Lux (lx) to Lumens (lm), you need to consider the area over which the illuminance is measured. Φ V(lm) = 500 lux × 4 m 2 = 2000 lm Lux to lumens calculator Example What is the luminous flux on a surface of 4 square meters and illuminance of 500 lux? In lumens (lm) is equal to the illuminance E v in lux (lx) times 4 times pi times the squared sphere radius r in meters (m): Lux (lx) times the surface area A in square meters (m 2):įor a spherical light source, the area A is equal to 4 times pi times In lumens (lm) is equal to the illuminance E v in Lm = 0.09290304 × lx × ft 2 Lux to lumens calculation with area in square meters Lux (lx) times 4 times pi times the squared sphere radius r in feet (ft): So the luminous flux Φ V in lumens (lm) is equal to 0.09290304 times the illuminance E v in Φ V(lm) = 0.09290304 × E v(lx) × A (ft2 )įor a spherical light source, the area A is equal to 4 times pi times the squared sphere radius: Lux (lx) times the surface area A in square feet (ft 2): The luminous flux Φ V in lumens (lm) is equal to 0.09290304 times the illuminance E v in Lux to lumens calculation formula Lux to lumens calculation with area in square feet When converting between lux and lumens, it's recommended to consult the specifications provided by the manufacturer or refer to photometric data specific to the light source being used for a more accurate conversion. Additionally, the conversion may vary depending on the efficiency of the light source and any losses in the optical system. It's important to note that this conversion assumes that the light is evenly distributed over the surface and that the distance from the light source is accounted for. To use this formula, multiply the lux value by the area of the surface being illuminated in square meters. Lumens (lm) = Lux (lx) x Area (in square meters) The formula for converting lux to lumens is: To convert lux to lumens, you need to know the area of the surface being illuminated and the distance from the light source. The relationship between lux and lumens depends on the area being illuminated and the distance from the light source. Lumens, on the other hand, measure luminous flux, which is the total amount of visible light emitted by a light source. Lux measures illuminance, which is the amount of light that falls on a surface. Lux (lx) and lumens (lm) are units of measurement used in lighting.

Lux lumen converter