1. What is a Candela to Lux Calculator?

Definition: This calculator converts luminous intensity (candela) to illuminance (lux) at a specified distance from a point light source.

Purpose: It helps lighting designers, engineers, and photographers determine the light intensity at different distances from a light source.

2. How Does the Calculator Work?

The calculator uses the inverse square law formula:

Where:

• Lux — Illuminance (lumens per square meter)
• Candela — Luminous intensity (lumens per steradian)
• d — Distance from light source (meters)

Explanation: The illuminance decreases with the square of the distance from the light source (inverse square law).

3. Importance of Lux Calculation

Details: Proper lux calculation ensures adequate lighting for tasks, safety, and visual comfort in various environments.

4. Using the Calculator

Tips: Enter the candela value (light source intensity) and distance from the light source in meters. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between candela and lux?
A: Candela measures luminous intensity (light output in a direction), while lux measures illuminance (light received per unit area).

Q2: Does this work for all light sources?
A: This calculation assumes an ideal point light source. For real-world sources, beam angle and reflectors affect results.

Q3: What's a typical candela value for common lights?
A: A candle ≈ 1 cd, 60W incandescent bulb ≈ 70 cd, LED flashlight ≈ 10,000-100,000 cd.

Q4: How does distance affect lux?
A: Lux decreases with the square of distance (at 2m, lux is 1/4 of value at 1m).

Q5: When would I need this calculation?
A: When designing lighting systems, setting up photography lighting, or ensuring workplace lighting meets standards.