Brooke Martin
Candles have been used for over two millennia, and were once a significant form of indoor lighting. However, with the invention of the incandescent light bulb in 1879, candles became less common and were instead marketed as decorative items. Despite this shift, there is still debate over whether a candle is considered incandescent. Incandescence refers to the production of light by heat or burning, which is how a filament light bulb operates. While a candle does not have a filament, it does produce light through the combustion of a wick embedded in wax, releasing heat and emitting light from the hot gas around the wick. This light is much dimmer than that of an incandescent bulb, with a luminous efficacy almost a hundred times lower.
| Characteristics | Values |
|---|---|
| Definition of incandescent light | Anything that produces light by heat/burning |
| Candle | A flame, not incandescent |
| Light bulb | Incandescent |
| Light produced by a candle | About 13 lumens |
| Light produced by an incandescent bulb | 440-799 lumens |
| Energy efficiency of a candle | 13-15 watts |
| Energy efficiency of an incandescent bulb | 60 watts |
| CO2 emissions of a candle | 16g per hour |
| CO2 emissions of an incandescent bulb | 500-1100g per hour |
| Energy efficiency of an LED bulb | 5W |
| Light produced by an LED bulb | Equivalent to a 40W light bulb |
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What You'll Learn
A candle is not incandescent, it is a flame
A candle is not incandescent; it is a flame. Incandescence and combustion are two different processes. Incandescent light is produced by heat or burning, like the filament in a traditional light bulb. The filament burns and glows brightly, but as it is in a vacuum, there is no flame or smoke.
A candle, on the other hand, is a flame. It is an ignitable wick embedded in wax or another flammable substance. As the wick of a candle is lit, it ignites the wax, which vaporizes and combines with oxygen to form a flame. This flame then melts the wax, which moves upward through the wick and is continually burnt, maintaining a constant flame.
The light from a candle is produced by the hot gas around the wick, but this gas is consumed and replenished constantly, unlike the filament in a bulb. The light produced by a candle is about 13 lumens, almost a hundred times lower than an incandescent light bulb.
The development of incandescent light bulbs and other superior lighting methods caused a rapid decline in the candle industry. Candles are now primarily used for decorative, symbolic, and aesthetic purposes, as well as in specific cultural and religious contexts.
While candles and incandescent bulbs both produce light, they do so through different mechanisms, with incandescent bulbs relying on the heating of a filament in a vacuum, and candles producing light through the combustion of a flame.
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Incandescence and combustion are two different processes
Incandescent light bulbs, on the other hand, produce light by heat or burning. A household light bulb has a thin metal filament that electricity flows through, causing it to burn and glow brightly. Since it is in a vacuum, there is no flame or smoke. The incandescent light bulb was invented in 1879, and since then, candles have been marketed as more of a decorative item.
The light from a candle is produced by the hot gas around the wick, which is constantly being consumed and replenished, unlike the filament in an incandescent bulb. The filament in an incandescent bulb does not get consumed in a chemical reaction with oxygen, as it is in a vacuum.
In terms of efficiency, the incandescent bulb is superior to the candle. It takes a significant number of candles to generate light equivalent to a 60-watt incandescent bulb. For example, it would take about 50 to 110 candles to produce the same amount of light as a 60-watt incandescent bulb, which would generate about 500-1100g of CO2 per hour. In comparison, a CFL bulb equivalent to a 60-watt incandescent bulb typically uses only 13-15 watts, producing 5g of CO2 per hour.
In conclusion, while both candles and incandescent light bulbs produce light, they do so through different processes. Candles rely on combustion and the constant replenishment of hot gas, while incandescent bulbs use heat or burning to excite a filament in a vacuum, producing a brighter and more efficient light.
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A candle's light comes from the hot gas around the wick
A candle is an ignitable wick embedded in wax or another flammable solid substance, such as tallow. When lit, the heat of the flame melts a small amount of the wax or solid fuel, which then vaporizes and combines with oxygen in the air to form a flame. This flame, in turn, melts the top of the solid fuel, which moves upward through the wick and is continually burned, maintaining a constant flame.
The light produced by a candle comes from the hot gas around the wick. As the solid fuel is consumed, the candle and wick shorten. The light from a candle is the result of combustion, which is distinct from incandescence. Incandescence is the production of light through heat or burning without combustion.
While candles rely on combustion to produce light, incandescent light bulbs use a thin metal filament that electricity flows through, causing it to burn and glow brightly. Unlike candles, incandescent light bulbs do not require a constant source of fuel to maintain their light output.
The efficiency of a candle's light production is significantly lower than that of an incandescent light bulb. For example, a candle typically releases heat at roughly 80 W, producing about 13 lumens of light. In comparison, an incandescent light bulb can provide the same amount of light while consuming significantly less power.
Furthermore, the use of candles can result in the release of combustion byproducts and greenhouse gases, such as carbon dioxide. The number of candles required to match the light output of an incandescent bulb contributes to a higher environmental impact.
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Incandescent light is produced by heat or burning
The combustion of a candle is a self-sustaining process. When the wick of a candle is lit, the heat melts and ignites the wax, which vaporises and combines with oxygen in the air to form a flame. The light produced by a candle comes from the hot gas around the wick. However, the gas is consumed and goes off into the air, requiring constant replenishment.
A candle is not the same as an incandescent lightbulb, which has a thin metal filament that electricity flows through, causing it to burn and glow brightly. Incandescent lightbulbs do not have a flame or produce smoke.
Incandescent lightbulbs are more efficient than candles, with one source stating that you would need to burn between 30 and 70 candles to generate light equivalent to a 60-watt incandescent bulb. Another source states that a single candle produces about 13 lumens of light, while a 60-watt incandescent bulb produces about 960 lumens.
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Candles are less efficient than incandescent bulbs
Candles have been used for over two millennia, and were once a significant form of indoor lighting. However, the candle industry declined rapidly with the invention of superior lighting methods, such as kerosene lamps and, most notably, the incandescent light bulb in 1879.
A candle is an ignitable wick embedded in wax or another flammable solid substance, which provides light and sometimes fragrance. The combustion of a candle is a self-sustaining process. As the wick of a candle is lit, the heat melts and ignites a small amount of solid fuel (the wax), which vaporises and combines with oxygen in the air to form a flame.
An incandescent light, on the other hand, is anything that produces light by heat or burning. A household light bulb has a thin metal filament that electricity flows through, causing it to burn. Since it's in a vacuum, there is no flame or smoke, just a bright glow.
A modern candle burns at a steady rate of about 0.1 g/min, releasing heat at roughly 80 W. The light produced is about 13 lumens, for a luminous efficacy of about 0.16 lumens per watt. This is almost a hundred times lower than an incandescent light bulb. For example, a 5W LED candle light bulb can replace a 40W filament candle light bulb. It consumes a fraction of the power but produces an incandescent sparkling effect.
To generate light equivalent to a 60-watt incandescent bulb, anywhere from 30 to 70 candles would need to be burned. This is a much less efficient method of producing light.
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Frequently asked questions
A candle is an ignitable wick embedded in wax or another flammable solid substance.
It depends on how you define "incandescent". If you define it as producing light by heat/burning, then a candle is incandescent in that the light comes from the hot gas around the wick. However, some sources claim that a candle is not incandescent because it is a flame, and incandescence and combustion are two different things.
As the wick of a candle is lit, the heat melts and ignites the wax, which vaporizes and combines with oxygen in the air to form a flame. The flame then melts the top of the wax, which moves upward through the wick and is continually burnt, maintaining a constant flame.
A modern candle typically releases heat at roughly 80 W, producing about 13 lumens of light. This is almost a hundred times lower than an incandescent light bulb.
It depends on the type of light bulb and the power source. Burning one candle generates about 16g of CO2 per hour, while a CFL bulb drawing electricity from a coal-fired power plant generates 5g of CO2 per hour. However, candles are less likely to cause house fires than open flames.
