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Lux Formula:
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The Lux formula calculates illuminance by dividing the total luminous flux (in lumens) by the area over which the light is distributed (in square meters). Lux is the SI unit of illuminance and measures how much luminous flux is spread over a given area.
The calculator uses the Lux formula:
Where:
Explanation: This formula shows the relationship between the total light output (lumens) and how that light is distributed over a surface area, resulting in the illuminance level (lux).
Details: Calculating lux is essential for lighting design in various settings including workplaces, homes, and public spaces. Proper illuminance levels are crucial for visual comfort, safety, and energy efficiency.
Tips: Enter the total luminous flux in lumens and the surface area in square meters. Both values must be positive numbers greater than zero.
Q1: What is the difference between lumens and lux?
A: Lumens measure the total amount of visible light emitted by a source, while lux measures the intensity of light as perceived on a surface.
Q2: What are typical lux levels for different environments?
A: Office work typically requires 300-500 lux, detailed work may need 750-1000 lux, while outdoor daylight can range from 10,000 to 100,000 lux.
Q3: How does distance affect lux levels?
A: Lux decreases with the square of the distance from the light source (inverse square law), meaning doubling the distance reduces illuminance to one-quarter.
Q4: Can I use this calculator for outdoor lighting?
A: Yes, the formula works for both indoor and outdoor lighting applications, as long as you have accurate lumen and area measurements.
Q5: How accurate is this calculation for real-world applications?
A: While the formula provides a theoretical value, real-world factors like reflectivity, light distribution patterns, and obstructions may affect actual illuminance levels.