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LED Lights

LED Comparison between LEDs, CFLs and Incandescent light bulbs

	LED	CFL	Incandescent
Light bulb projected lifespan	50,000 hours	10,000 hours	1,200 hours
Watts per bulb (equiv. 60 watts)	6	14	60
Cost per bulb	$35.95	$3.95	$1.25
KWh of electricity used over 50,000 hours	300	700	3000
Cost of electricity (@ 0.20per KWh)	$60	$140	$600
Bulbs needed for 50k hours of use	1	5	42
Equivalent 50k hours bulb expense	$35.95	$19.75	$52.50
Total cost for 50k hours	$95.95	$159.75	$652.50

Energy Savings over 50,000 hours, assuming 25 bulbs per household:

Total cost for 30 bulbs	$2398.75	$3993.75	$16,312.50
Savings to household by switching from incandescents	$13,913.75	$12,318.75	0

A Light Emitting Diode (LED) is a semiconductor device which converts electricity into light. LED lighting has been around since the 1960s, but is just now beginning to appear in the residential market for space lighting. At first white LEDs were only possible by "rainbow" groups of three LEDs -- red, green, and blue -- by controlling the current to each to yield an overall white light.  This changed in 1993 when Nichia created a blue indium gallium chip with a phosphor coating that is used to create the wave shift necessary to emit white light from a single diode. This process is much less expensive for the amount of light generated.

Each diode is about 1/4 inch in diameter and uses about ten milliamps to operate at about a tenth of a watt. LEDs are small in size, but can be grouped together for higher intensity applications. LED fixtures require a driver which is analogous to the ballast in fluorescent fixtures. The drivers are typically built into the fixture (like fluorescent ballasts) or they are a plug transformer for portable (plug-in) fixtures. The plug-in transformers allow the fixture to run on standard 120 volt alternating current (AC), with a modest (about 15 to 20 percent) power loss.

The efficacy of a typical residential application LED is approximately 20 lumens per watt (LPW), though efficacies of up to 100 LPW have been created in laboratory settings. Incandescent bulbs have an efficacy of about 15 LPW and ENERGY STAR® qualified compact fluorescents are about 60 LPW, depending on the wattage and lamp type. Some manufacturers claim efficacies much higher than 20 LPW; make sure to examine system efficacy, which accounts for the power use of all components. In December 2006, the U.S. Department of Energy studied the efficacy of four luminaries. All four fell short of the manufacturers’ claims; the study implies that manufacturers are relying on measurements of how much light an isolated LED produces, rather than how much light an LED luminaire actually delivers.

LEDs are better at placing light in a single direction than incandescent or fluorescent bulbs. Because of their directional output, they have unique design features that can be exploited by clever designs. LED strip lights can be installed under counters, in hallways, and in staircases; concentrated arrays can be used for room lighting. Waterproof, outdoor fixtures are also available. Some manufacturers consider applications such as gardens, walkways, and decorative fixtures outside garage doors to be the most cost-efficient.

LED lights are more rugged and damage-resistant than compact fluorescents and incandescent bulbs. LED lights don't flicker. They are very heat sensitive; excessive heat or inappropriate applications dramatically reduce both light output and lifetime. Uses include:

• Task and reading lamps
• Linear strip lighting (under kitchen cabinets)
• Recessed lighting/ceiling cans
• Porch/outdoor/landscaping lighting
• Art lighting
• Night lights 
• Stair and walkway lighting
• Pendants and overhead
• Retrofit bulbs for lamps

Definitions and Terms

Term	Definition	Units	How to interpret
Color Temperature	Color of light	Kelvin (K)	Sunlight at sunrise is 1800K 100W Incandescent light bulb is 2850K Overcast Sky is 6500K
Color Rendering Index (CRI)	Light’s effect on color	Scale of 0 to 100 with sunlight at 100	The higher the number, the more “true” the color will look in that light
Brightness	The intensity of the light.	Lumens	The higher the lumens, the brighter the light
Power	Amount of electrical energy consumed	Watts	Lower the watts, the lower the energy consumed
Efficacy	The efficiency of the bulb to convert electricity into light	Lumens per Watt	More efficient bulbs provide more light using less energy

Initial Cost 

The biggest limitation to LED for common residential use is the cost of manufacturing due to still-limited production runs. Manufacturers claim production will increase considerably in the near future, further lowering prices. Currently, there is a limited number of LED fixture manufactures, but this is changing. Retrofit bulbs range from $25 to $60 for night lights and small lamps.

Operational Cost 

The cost savings of LEDs can be found in smaller wattage lamps or for applications that take advantage of their longevity, such as difficult to reach places. They are also advantageous for dimmable fixtures, since dimmable fluorescents are expensive.

U.S.Code Acceptance

As with any electrical device, LED fixtures must be listed for use such as with a testing laboratory label. LEDs are not specifically referenced in building codes.

Installation

The small size of LED lights encourages a variety of design options. White LED lamps are available with Edison (screw-in type) bases to retrofit existing fixtures. There are LED strips that can be used under cabinets. In addition, outdoor landscaping fixtures are available.

Warranty

Warranties for LEDs can range from 3 to 5 years, depending on the manufacturer. 

Benefits/Costs

LED lamps have many advantages over traditional lighting methods.   These include:

• Low energy consumption – retrofit bulbs range from 0.83 to 7.3 Watts
• Long service life – LED bulbs can last up to 50,000 hours
• Durable – LED bulbs are resistant to thermal and vibrational shocks and turn on instantly from -40C° to 185C°, making them ideal for applications subject to frequent on-off cycling, such as garages and basements
• Directional distribution of light – good for interior task lighting
• No infrared or ultraviolet radiation – excellent for outdoor use because UV light attracts bugs
• Safety and environmentally conscious – LEDs contain no mercury and remain cool to the touch
• Fully dimmable – LEDs do not change their color tint when dimmed unlike incandescent lamps that turn yellow
• No frequency interference – no ballast to interfere with radio and television signals
• Range of color – LEDs can be manufactured produce all colors of the spectrum without filters, they can also produce white light in a variety of color temperatures

There are some current disadvantages to LED lighting:

• LEDs are currently more expensive than more conventional lighting technologies, and may be hard to locate
• LED are very heat sensitive. Excessive heat or inappropriate applications dramatically reduce both light output and lifespan
• LEDs typically cast light in one direction at a narrow angle compared to incandescent or fluorescent lamps so lenses or reflectors are needed in fixtures to broaden the beam (if desired)

LED Comparison between LEDs, CFLs and Incandescent light bulbs

	LED	CFL	Incandescent
Light bulb projected lifespan	50,000 hours	10,000 hours	1,200 hours
Watts per bulb (equiv. 60 watts)	6	14	60
Cost per bulb	$35.95	$3.95	$1.25
KWh of electricity used over 50,000 hours	300	700	3000
Cost of electricity (@ 0.20per KWh)	$60	$140	$600
Bulbs needed for 50k hours of use	1	5	42
Equivalent 50k hours bulb expense	$35.95	$19.75	$52.50
Total cost for 50k hours	$95.95	$159.75	$652.50

Energy Savings over 50,000 hours, assuming 25 bulbs per household:

Total cost for 30 bulbs	$2398.75	$3993.75	$16,312.50
Savings to household by switching from incandescents	$13,913.75	$12,318.75	0

Download LED Energy Savings Calculator

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Household LED Lights	LED Light Fixtures	LED Nightlights & Steplights	LED Outdoor Lighting	MR11 & MR16 LED Bulbs
PAR 20 LED Lamps	PAR 30 LED Lamps	PAR 38 LED Lamps	Dimmable LED Bulbs	LED Flourescent Replacements

 

 

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