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Lumen To Candlepower Formula:
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The Lumen To Candlepower conversion calculates the luminous intensity (candlepower) from the total luminous flux (lumens) for an isotropic light source. This conversion is based on the assumption that light is emitted equally in all directions.
The calculator uses the formula:
Where:
Explanation: This formula converts total light output (lumens) to luminous intensity (candlepower) for an isotropic light source that radiates equally in all directions.
Details: Candlepower measurement is important in lighting design, photometry, and comparing the directional intensity of light sources. It helps determine how much light is concentrated in a particular direction.
Tips: Enter the total luminous flux in lumens. The value must be greater than zero. The calculator will compute the corresponding candlepower for an isotropic light source.
Q1: What is the difference between lumens and candlepower?
A: Lumens measure total light output in all directions, while candlepower measures luminous intensity in a specific direction.
Q2: When is this conversion accurate?
A: This conversion is accurate only for isotropic light sources that emit light equally in all directions.
Q3: What are typical candlepower values?
A: Candlepower values vary widely depending on the light source. A standard candle produces about 1 candela, while modern LEDs can produce hundreds or thousands of candelas.
Q4: How does directionality affect this conversion?
A: For directional light sources (spotlights, LEDs), the actual candlepower will be higher than calculated because light is concentrated in specific directions rather than distributed evenly.
Q5: Can this be used for all light sources?
A: No, this conversion is specifically for isotropic sources. For directional sources, manufacturer specifications or goniophotometric measurements are needed for accurate candlepower values.