1. What is Lux?

Lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It indicates how much luminous flux is spread over a given surface area.

2. How Does the Calculator Work?

The calculator uses the lux formula:

Where:

• \( Lumens \) — Total luminous flux (lm)
• \( Area \) — Surface area in square meters (m²)

Explanation: Lux measures the intensity of light as perceived by the human eye on a surface. One lux is equal to one lumen per square meter.

3. Importance of Lux Calculation

Details: Lux calculation is essential for lighting design, photography, workplace safety standards, and ensuring adequate illumination for various tasks and environments.

4. Using the Calculator

Tips: Enter total lumens and surface area in square meters. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between lumens and lux?
A: Lumens measure total light output, while lux measures light intensity per unit area. Lumens indicate brightness, lux indicates how bright a surface appears.

Q2: What are typical lux values for different environments?
A: Office lighting: 300-500 lux, supermarket: 750 lux, operating theater: 1000 lux, full daylight: 10,000-25,000 lux, direct sunlight: 32,000-100,000 lux.

Q3: How does distance affect lux levels?
A: Lux decreases with the square of the distance from the light source (inverse square law). Doubling the distance reduces illuminance to one quarter.

Q4: Can this calculator be used for outdoor lighting?
A: Yes, the same formula applies for both indoor and outdoor lighting calculations, though outdoor measurements may be affected by environmental factors.

Q5: How accurate is this calculation?
A: The calculation provides theoretical values based on the formula. Actual lux levels may vary due to reflection, absorption, and other environmental factors.