1. What is Candlepower to Lumens Conversion?

The candlepower to lumens conversion calculates the total luminous flux (lumens) from the luminous intensity (candlepower). This conversion is essential for comparing and specifying lighting performance across different measurement systems.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

Where:

• \( Candlepower \) — Luminous intensity in candelas (cd)
• \( 12.57 \) — Conversion factor (4π steradians)

Explanation: The formula converts directional intensity (candlepower) to total luminous flux (lumens) assuming an omnidirectional light source.

3. Importance of Light Measurement Conversion

Details: Accurate conversion between candlepower and lumens is crucial for lighting design, product specification, and comparing light source performance across different measurement standards.

4. Using the Calculator

Tips: Enter candlepower value in candelas (cd). The value must be greater than zero. The calculator assumes an omnidirectional light source.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 12.57?
A: The factor 12.57 represents 4π steradians (the total solid angle around a point), converting directional intensity to total luminous flux for omnidirectional sources.

Q2: Is this conversion accurate for all light sources?
A: This conversion is most accurate for truly omnidirectional light sources. Directional sources may require different calculations based on their beam angle.

Q3: What's the difference between candlepower and lumens?
A: Candlepower measures luminous intensity in a specific direction, while lumens measure total light output in all directions.

Q4: When should I use this conversion?
A: Use this conversion when you need to compare light sources specified in different units or when converting historical candlepower measurements to modern lumen values.

Q5: Are candlepower and candela the same?
A: Yes, candlepower is an older term for candela. Both refer to luminous intensity measured in candelas (cd).