Difference Between Lumens and Candlepower
If you are shopping for a handheld light whether it be a
flashlight or spotlight, you will notice that the packaging will use terms like
lumens or candlepower to measure the brightness of the light generated. However, what do the terms lumens and
candlepower actually mean and how are they related.
The term candle power is most commonly used when describing
spotlights. Candlepower is the measure
of radiance produced by the light at its source . As the name suggests it is a measurement
based on the light produced by a single candle.
For instance, a 2 million candlepower spotlight creates the equivalent
radiance of 2 million candles at its source.
Lumens is commonly used when describing the brightness of
flashlights and now even spotlights.
Lumens is a measurement of the light that illuminates an area. It is
based on the illumination of a 1 square foot area one foot away from one
Comparing Lumens and Candle Power
A simple formula exists for comparing candlepower against
lumens. To determine the lumens in
multiply the candlepower by 12.57 or rather 1 candlepower equals 12.57
lumens. To determine the candlepower,
dived the lumen by 12.57.
Ex: A 2 million candlepower
spotlight equals 25,140,000 lumens. While a flashlight with 150 lumens will
equal 11.93 candlepower.