Is an incandescent light bulb more or less energy efficient than an LED one? Explain in terms of light and thermal energy.
Answers
Answer:
LED's have efficiencies between 75 and 95 percent, making them four to five times more efficient than incandescent bulbs. ... A single 20-watt compact fluorescent light bulb (CFL), compared to a 75-watt incandescent light bulb, saves about 550 kWh of electricity over its lifetime.
Explanation:
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Incandescent light bulbs create light by heating a filament inside the bulb; the heat makes the filament white-hot, producing the light that you see. Halogen light bulbs create light through the same method. Because incandescent and halogen bulbs create light through heat, about 90% of the energy used is wasted to generate heat. To reduce the heat emitted by regular incandescent and halogen bulbs, use a lower watt bulb (like 60 watts instead of 100).
Fluorescent light bulbs use an entirely different method to create light. Both compact fluorescent light bulbs and fluorescent linear tubes only waste approximately 30% of their energy in heat, making them far cooler and more energy efficient than regular bulbs. Fluorescent light bulbs are an ideal choice whenever reducing heat or saving energy is important.
Is a fluorescent light bulb more or less energy efficient than an incandescent one? Explain in terms of light and thermal energy.
Source Estimating LED Lumens for Your Space
Incandescent light bulbs create light by heating a filament inside the bulb; the heat makes the filament white-hot, producing the light that you see. Halogen light bulbs create light through the same method. Because incandescent and halogen bulbs create light through heat, about 90% of the energy used is wasted to generate heat. To reduce the heat emitted by regular incandescent and halogen bulbs, use a lower watt bulb (like 60 watts instead of 100).
Fluorescent light bulbs use an entirely different method to create light. Both compact fluorescent light bulbs and fluorescent linear tubes only waste approximately 30% of their energy in heat, making them far cooler and more energy efficient than regular bulbs. Fluorescent light bulbs are an ideal choice whenever reducing heat or saving energy is important.
Source How much heat is emitted by incandescent, halogen, and compact fluorescent light bulbs? | Litetronics
Contrary to some marketing claims, LED bulbs do indeed generate heat as does anything that consumes electricity. The important thing to keep in mind is that LEDs consume a lot less energy than incandescent or halogen bulbs and are much more efficient in how they use that energy versus traditional bulb types.
Thus while LEDs will generate heat, it will be a fraction of that compared to a traditional technology bulb. The ultimate temperature at which the external housing of the LED will operate at is influenced by the temperature of the room and the fixture it is placed in.
LED bulbs have many components inside to change the high voltage electricity from your home or building to the lower voltage that the LED chips need to run. Because of this, they are much more sensitive to heat than incandescent or halogen sources. You will frequently find that many low cost LED bulbs carry a warning that they should not be placed in fully enclosed fixtures. The reason for this is that this heat build up can shorten the life of the components inside of the LED bulb. Only use fully enclosed rated LED bulbs in fixtures of this type or you may void the warranty.
Overall though, the lower heat generated by LEDs makes them a great choice for applications such as task lighting and illumination of heat sensitive objects such as food or artwork that can be damaged by heat.