1. What is Lux?

Lux (lx) is the SI unit of illuminance, measuring luminous flux per unit area. It indicates how much light is spread over a given surface area.

2. How Does the Calculator Work?

The calculator uses the lux formula:

Where:

• \( \text{lux} \) — Illuminance (light intensity per area)
• \( \text{lumen} \) — Total luminous flux (light output)
• \( \text{area} \) — Surface area in square meters

Explanation: Lux measures how much light actually reaches a surface, while lumens measure the total light emitted by a source.

3. Importance of Lux Calculation

Details: Proper lux levels are crucial for lighting design in workplaces, homes, and public spaces to ensure adequate visibility and comfort while avoiding glare or eye strain.

4. Using the Calculator

Tips: Enter the total lumens of your light source and the area you want to illuminate. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are typical lux levels for different spaces?
A: Offices need 300-500 lx, kitchens 500-700 lx, while precision work may require 1000-2000 lx.

Q2: How does lux differ from lumens?
A: Lumens measure total light output, while lux measures light intensity at a surface.

Q3: Does distance affect lux?
A: Yes, lux decreases with distance from the light source following the inverse square law.

Q4: How many lux is sunlight?
A: Direct sunlight can be 32,000-100,000 lx, while overcast daylight is about 1,000 lx.

Q5: How do I convert lux to lumens?
A: Multiply lux by area (in m²) to get lumens for that surface.