They are more energy-efficient than incandescent light bulbs using between one third and one fifth of the energy. Modern CFLs typically last at least six times as long and use at most a quarter of the power of an equivalent incandescent bulb. The life of a CFL is significantly shorter if it is used only for a few minutes at a time. Log in. Categories : Energy Use Lighting. Cookies help us deliver our services.
By using our services, you agree to our use of cookies. More information OK. Both halogen and incandescent bulbs produce light by heating a tungsten filament with an electrical current. Compact fluorescent lamps CFLs , on the other hand, create light through an entirely different mechanism.
The fluorescent gas inside the bulb produces ultraviolet light when electrified, and the lamp's coating converts the ultraviolet light into visible light. Because of this, CFLs are between 67 percent and 80 percent more energy-efficient than incandescent bulbs. Halogen lamps stand somewhere in between, ranked as more efficient than normal incandescent bulbs, but not as efficient as fluorescent lights.
Points: 5. Basically CFL need more energy to start emitting a light, but it is provided with a ballast which boosts the power and gives power to glow. Once the lamp starts emitting light the ballast regulates the current flow. Thus, saving energy. This electronic mechanism is not followed in incandescent lamps rather they follow the heat principle.
When the current is passed through a normal lamp [incandescent lamp, the filament, usually made of Tungsten, is heated producing bright light. To heat this filament continuously for long time it requires great amount of energy. But, in CFL filaments are replaced by twisted or bent glass tubes coated with phosphor.
When the current is passed through these tubes mercury, present in the tube, charges and emits ultraviolet light. This ultraviolet light is absorbed by the phosphor coating and gives bright and visible light. More amount of energy is required only to kick start this process, later very less energy is required. This is the major reason CFL's are considered as energy saving than incandescent lamps.
Points: 8. Bulbs with similar wattage may vary in lumens. The FTC has mandated that all light bulb packages display lumens as the primary measure for comparing bulbs. For more information about lumens, see LED Terminology further down this page. New LED bulbs are available as combination three-way bulbs. Some LED bulbs are now available as dimmable bulbs. They will work with any standard dimmer switch. They are inexpensive because the bulbs use a low-quality chip, which fails easily.
LEDs have mechanisms to dissipate heat build-up, but these require more airflow than many common light fixtures permit. Bulbs designed for enclosed fixtures will last longer than standard LEDs. Look for explicit statements saying that a bulb works inside enclosed light fixtures. Because heat can also be an issue with recessed lighting, look for a description that indicates its suitability for recessed fixtures. Omnidirectional bulbs will cast light over a wide area, while spotlights and floodlights will have a narrower band of illumination.
The Energy star certification means that the bulb has met the specifications for energy efficiency set by the U. Environmental Protection Agency. UL stands for Underwriters Laboratories, a third-party American safety testing organization. The UL label indicates the product has met with electrical safety standards. RoHS restricts amounts of certain substances commonly used in electronic equipment, including lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers PBDE.
Federal Communications Commission. Available in standard Edison bases, these bulbs have many uses, such as area lighting for rooms, porches, reading lamps, accent lamps, hallways and low-light applications where lights remain on for extended periods. Designed for bathroom vanities or anywhere a globe bulb is required, these bulbs produce light equivalent to a watt incandescent bulb, yet only consume 10 watts of power.
LEDs do not contribute to heat build up in a room because no matter how long they remain on, they do not get hot to the touch. LEDs are now available for standard recessed lighting pots and housings. They range from 7. Several models are dimmable. Designed to replace incandescent candelabra bulbs, these flame tip LEDs deliver the equivalent light of a 25 — 35 watt incandescent while only drawing 3.
Because fluorescent lights are often installed in high ceilings in commercial sites, there are additional savings because the frequency of changing bulbs is greatly reduced.
LED panel lights come in a variety of sizes and can replace overhead tube lighting in both commercial and residential applications. Plus they can last for decades, making them an even more budget-friendly choice. CRI represents the quality of light and its faithfulness to render colors correctly, that is, to enable us to perceive colors as we know them. The ideal CRI is , and some incandescent bulbs approach this level. CCT is the measure used to describe the relative color appearance of a white light source.
A unit of standard measurement that is used to describe the amount of light contained in an area as perceived by the human eye. The more lumens, the brighter the light. The flow of light measured in lumens. With light bulbs, it provides an estimate of the apparent amount of light the bulb will produce. In practical application, when buying a light bulb, look for bulbs that produce more light but consume less energy.
Understanding lumens as a measure of brightness makes it easier to select the most efficient bulb for your application. But LEDs are also available in colors and used as individual bulbs, or in clusters, for special applications. Red is the traditional color for maintaining night vision. Some LED headlamps and flashlights have the option of switching to red light for use at night.
Green is now the preferred light color for pilots and the military. Many people like blue light because it feels easy on the eyes, but research indicates that some lights in the blue spectrum can affect human circadian rhythms and therefore, sleep.
Scientists now recommend against using objects lit with blue light hours before bedtime. The most popular of the LED colors. It produces a soft white light, without harsh reflection, glare or shadows. LED amber bulbs do not attract flying insects like ordinary white bulbs. Amber LEDs are used outdoors in areas such as patios and decks where insects flying around lights are a nuisance. To compare different light bulbs, you need to know about lumens.
Lumens, not watts, tell you how bright a light bulb is, no matter the type of bulb. While lumens are the best measurement of comparative lighting among the various bulbs, they are not always a perfect measure. Some floodlights use an internal reflector in the bulb to send the light facing downward. When shopping for light bulbs, note that bulbs equipped with reflectors will deliver increased directional light.
The chart below shows the amount of brightness in lumens you can expect from different wattage light bulbs. Treat any broken bulb as hazardous waste, which means wearing gloves and a mask and cleaning the area thoroughly. Double bag the bulb fragments and any cleaning tools used and contact your local hazardous waste site for instructions on their preferred method of disposal. Many will likely have you simply throw it in the trash, while others will ask that you bring it to the hazardous waste collection site.
While LEDs are recyclable, recycling programs are few and far between. Call your local recycling collection center to find out if LED bulb recycling is available in your area. You can also try searching at Recycle Nation for a recycling facility that accepts LED bulbs near you. CFLs are four times more efficient and last up to 10 times longer than incandescents. A 22 watt CFL has about the same light output as a watt incandescent.
A single 18 watt CFL used in place of a 75 watt incandescent will save about kWh over its lifetime. Replacing a single incandescent bulb with a CFL will keep a half-ton of CO2 out of the atmosphere over the life of the bulb. If everyone in the U. Saving electricity reduces CO2 emissions, sulfur oxide and high-level nuclear waste.
They use rare earth phosphors for excellent color and warmth. CFLs can be applied nearly anywhere that incandescent lights are used.
Energy-efficient CFLs can be used in recessed fixtures, table lamps, track lighting, ceiling fixtures and porch lights.
Three-way CFLs are also now available for lamps with 3-way settings. Dimmable CFLs are also available for lights using a dimmer switch. CFLs come in many shapes and sizes.
When purchasing CFLs, consult the seller for recommendations and consider the following:. CFLs with K numbers between give off a soft bright light like incandescents. CFLs with K numbers between give off a bright light. As you go up the K number scale the light gets bluish and closer to daylight.
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