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Candle Power Formula:
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Candle power is an older term used to describe the intensity of light emitted by a source, but it has largely been superseded by the SI unit candela for modern illumination measurements. It represents the luminous intensity in a specific direction.
The calculator uses the Candle Power formula:
Where:
Explanation: Candle power is calculated by dividing the total luminous flux by the solid angle over which the light is distributed.
Details: Candle power measurement is important for understanding the directional intensity of light sources, which is crucial in lighting design, photometric testing, and comparing the performance of different light sources.
Tips: Enter luminous flux in lumens and solid angle in steradians. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is the difference between candle power and lumens?
A: Candle power measures luminous intensity in a specific direction, while lumens measure the total light output in all directions.
Q2: Why is candle power considered an older term?
A: Candle power has been largely replaced by the SI unit candela, which provides a more standardized and precise measurement of luminous intensity.
Q3: What is a solid angle in lighting measurements?
A: Solid angle measures the extent of a cone-shaped region in three-dimensional space, quantifying how much of the surrounding space is covered by the light beam.
Q4: How is candle power used in practical applications?
A: It's used in spotlight and directional lighting design, automotive headlight testing, and any application where directional light intensity is important.
Q5: Can candle power be converted to other light measurement units?
A: Yes, 1 candle power is approximately equal to 0.981 candela, though the conversion may vary slightly based on specific definitions and standards.