Chloe Adams
Candlepower, an obsolete unit expressing luminous intensity, is equal to 0.981 candelas. It measures the brightness of a light source in terms of the light emitted by a candle of specific size and constituents. While candlepower is valuable in certain contexts where directional intensity is a priority, lumens offer a more practical approach for assessing overall performance. For example, a 1-million-candela spotlight used for night fishing can light up an entire forest or blind animals. A 35-watt handheld halogen spotlight is about 1 million candlepower, which is roughly equivalent to a 25-watt LED or 20-watt HID.
| Characteristics | Values |
|---|---|
| Candlepower | An obsolete unit expressing luminous intensity |
| Candlepower vs Candela | 1 candlepower = 0.981 candelas |
| Lumens | A metric equivalent to foot-candles; measures total light output |
| Lumens vs Candlepower | 1 candlepower = 12.57 lumens |
| 1 million candlepower | 12,566,370 lumens |
| 1 million candlepower | Equivalent to a 20w MR11 bulb |
| 1 million candlepower | Equivalent to a 35-watt handheld halogen spotlight |
| 1 million candlepower | Equivalent to a 25-watt LED |
| 1 million candlepower | Equivalent to a 20-watt HID |
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What You'll Learn
Candlepower is an obsolete unit
Candlepower, an obsolete unit of measurement for luminous intensity, expresses levels of light intensity relative to the light emitted by a candle of specific size and constituents. In 1948, the international unit (SI) candela replaced candlepower. One candlepower unit is about 0.981 candela. In modern usage, candlepower is sometimes used as a synonym for candela, with one candela being close to the light intensity produced by an ordinary candle as perceived by the human eye.
The term candlepower was originally defined in the United Kingdom by the Metropolitan Gas Act 1860 as the light produced by a pure spermaceti candle weighing one-sixth of a pound and burning at a rate of 120 grains per hour (7.8 grams per hour). Spermaceti is a material derived from the heads of sperm whales that was historically used to make high-quality candles. While candlepower is obsolete, it is still occasionally used to describe the luminous intensity of high-powered flashlights and spotlights.
Candlepower is distinct from lumens, which measures the total visible light output of a source, and watts, which measures total power output. Lumens are a more practical unit for assessing the overall performance of lighting in everyday household settings, whereas candlepower is more useful in contexts where directional intensity is a priority, such as in search and rescue operations.
While the exact brightness of 1 million candlepower is unclear, it is evident that such a high level of luminous intensity would be extremely bright. For example, a 35-watt handheld halogen spotlight is approximately equivalent to 1 million candlepower, and a user on a forum described a 1-million-candela spotlight for night fishing as "crazy bright", stating that it could light up entire woods or blind animals.
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Lumens are a more practical approach
Candlepower, or candela, is a measure of the luminous intensity of a light source. It is based on the light emitted by a candle of a specified size and composition. While candlepower is valuable in certain contexts where directional intensity is a priority, lumens offer a more practical approach for assessing overall performance.
Lumens are a measure of the total light output of a source, regardless of beam focus or direction. Each unit of light output is a single lumen. The amount of light emitted by a source can be hundreds or thousands of lumens. For example, a 100-watt lightbulb emits light in all directions, and the total light output is measured in lumens.
The main difference between candlepower and lumens is that candlepower measures the brightness of a directed beam, while lumens measure the total light output. This means that a flashlight with a high lumen count may appear brighter when looked at directly, but a flashlight with high candlepower will have a more focused beam.
For example, a flashlight with 200 lumens and a peak beam intensity of 25,000 candlepower will have a more focused beam than a flashlight with the same lumen count and a peak beam intensity of 12,000 candlepower. Similarly, a flashlight with 500 lumens and 15,000 candlepower will have a wider throw than a flashlight with 200 lumens and the same candlepower.
Understanding the lumens output is essential for selecting the right intensity for specific requirements, balancing brightness and energy efficiency. For instance, in search and rescue operations, a high-candlepower flashlight may be preferred for its long-distance spotlighting ability. In contrast, in everyday household lighting, lumens are the focal point as they indicate how much light will be emitted in all directions, resulting in a well-illuminated space.
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Candlepower is useful for search and rescue
Candlepower is an obsolete unit expressing luminous intensity, equal to 0.981 candelas. It expresses levels of light intensity in terms of the light emitted by a candle of specific size and constituents. In modern usage, candlepower equates directly to the unit known as the candela.
For example, a K9 handler in search and rescue might need to search for victims in a fallen building or in the wilderness. They would require a light source that is as bright as possible, with a long battery life, and that can fit on their tactical vest or leg pouch. A high candlepower flashlight would be ideal for this situation, as it would provide a bright light over a long distance, helping the handler to search for victims effectively.
In another example, a rescuer might need to navigate through thick mountainous terrain at night. They would require a headlamp that is lightweight, rugged, reliable in all weather conditions, and with a long battery life. A headlamp with high candlepower would allow the rescuer to see their surroundings clearly and navigate through the difficult terrain safely.
Additionally, candlepower can be useful for rescuers who need to carry stretchers or other equipment. Having a bright light with a long-distance beam can help them see their path and avoid obstacles while keeping their hands free to carry the necessary equipment.
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Lumens are a metric equivalent to foot-candles
Candlepower is an obsolete unit expressing luminous intensity, equal to 0.981 candelas. It expresses levels of light intensity in terms of the light emitted by a candle of specific size and constituents. In modern usage, candlepower equates directly to the unit known as the candela.
A lumen is the amount of light given off by a light source, and a foot-candle is the measure of lumens per square foot. One foot-candle equals one lumen per square foot. Foot candles are the imperial measurement, and lux is the metric measurement of the same thing. Lux is an SI-derived measurement commonly used in Europe.
The Illuminating Engineering Society of North America (IES) has set guidelines to determine the amount of lumens needed to light various rooms in a house. Lumens are a far more accurate representation of a light's capacity than watts. Lumens offer a more practical approach for assessing overall performance, indicating how much light will be emitted in all directions, resulting in a well-illuminated space.
Foot-candles are used to ensure that areas requiring certain light levels are receiving those levels. They are especially important in electrical construction, offices, manufacturing facilities, and workrooms, where higher foot-candle measurements are needed to make work easier on the eyes. In sports lighting, foot-candles ensure optimal visibility for players and spectators.
Comparing light output using candlepower and lumens provides valuable insights into the distinct aspects of brightness measurement. While candlepower is valuable in certain contexts where directional intensity is a priority, lumens are the focal point in everyday household lighting.
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Candlepower is reflector-dependent
Candlepower, an obsolete unit of luminous intensity, is reflector-dependent. The size of the reflector, its alignment with the horizon, and the quality of the reflector all influence the effective candlepower. For instance, a high-quality 21-inch diameter silvered-parabolic reflector can collect and reflect 39% of the total light from a lamp, resulting in a concentrated beam of light that increases the lamp's power by approximately 350 times. This means that a lamp with an initial output of 6-7 candlepower can produce 2450 candlepower when paired with an efficient reflector.
The effective candlepower decreases significantly as one moves away from the central axis of the reflector. At positions just 8 degrees off-center, the candlepower drops to 10% of that in the middle, and the light intensity diminishes rapidly beyond this point. This narrow beam of intense light requires precise alignment for observation at a distance.
The type of fuel used, the maintenance of the lamp, and external factors such as air clarity also impact the candlepower. While candlepower is useful in certain directional applications, like search and rescue operations, lumens are a more practical unit for measuring overall lighting performance. Lumens indicate the total light emitted in all directions, creating a well-illuminated space.
To illustrate the relationship between candlepower and lumens, 1 million candlepower is equivalent to 12,566,370 lumens. Additionally, the use of a reflector can further enhance the lumen output. For example, a narrow reflector can multiply the lumen output of an LED by a significant factor, increasing the overall brightness.
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Frequently asked questions
1 million candle power is extremely bright. It is the equivalent of 12,566,370 lumens or 1,000,000 candelas.
Candle power refers to the highest value of light intensity found in a light's beam, whereas lumens refer to the total light output of a light source.
No, candle power and lumens are two different measures and are not directly convertible. However, one candle power is roughly equivalent to 12.57 lumens.
Candle power is useful in certain contexts where directional intensity is a priority, such as in search and rescue operations.
Yes, some users have reported purchasing \$15 portable handlights that offer 1 million candle power.
