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LED Frequently Asked Questions


What is LED?

Any discount available for the big quantity order?

Can I have the sample of Eneltec LED Lighting products?

What are LEDs and how do they work?

Application of LED?

LED with ordinary incandescent lamp, spiral energy-saving lamps and T5 fluorescent trichromatic comparison?

What are the advantages of LED?

Are LEDs Expensive?

Are LEDs really environmentally friendly?

Do LED products give off any heat?

Why Led lamp is the best one for frequently turn on and turn off?

Where have LEDs been used in the lighting industry?

Why does the identical LED chip package lumen depreciate at different rates from manufacturer to manufacturer?

What are the advantages to using LED luminaires?

What's the difference between efficiency and efficacy?

Why are LEDs considered a GREEN technology?

How do you evaluate LED products?

If an LED fixture has lower initial lumen output than a traditional HID light, how can LED claim to deliver lumens more efficiently than HID?

How does ambient temperature affect LED efficiency?

Do I have to replace LEDs?

Why is the life span of an LED measured as lumen depreciation?

How long is 100,000 hours?

 


What is an LED?
LED is the common abbreviation for a light-emitting diode. Each individual LED consists of a semiconductor diode that emits light when a voltage is applied to it. The electronics industry has used LED technology for several decades as indicator lights for various electronic devices. In more recent years, LED technology has progressed to the point where it is viable for general lighting applications. Please check the following website for more information.

 

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Any discount available for the big quantity order?
The price of our LED lights products can be negotiated if you have big quantity order or some projects in hand.

 

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Can I have the sample of Eneltec LED Lighting products?
Sure, you can order the sample from us. Pls let us know the Model No. and the Quantity. Normally, we will have many stored for the standard LED Lighting products.

 

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What are LEDs and how do they work?
LEDs or Light Emitting Diodes are a form of semi-conductor. They do not have the gas filled chambers or lighting filaments associated with conventional lamp types. When you pass a current through the LED it results in the required outcome of light or electroluminescence. Eneltec LEDs present many advantages over conventional light sources including lower energy consumption, longer lifetime, improved robustness, smaller size, faster switching and greater durability and reliability.

 

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Application of LED?
LEDs are with wide application areas, including communications, consumer electronics, autos, lighting, signal lights and so on. And it can be roughly divided into top five industries: backlight, lighting, electronic equipment, displays, automotive. LED lighting has been gradually developed to the stage of commercialization, LED spotlights, LED bulbs and LED lamp has had the feasibility of replace the traditional light sources in cost.

 

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LED with ordinary incandescent lamp, spiral energy-saving lamps and T5 fluorescent trichromatic comparison?
Ordinary incandescent light efficiency with 12lm / W, life expectancy is less than 2000 hours. Spiral energy-saving lamps for light efficiency 60lm / W, life expectancy is less than 8000 hours. T5 fluorescent lamps compared with 96lm / W, life expectancy is approximately 10,000 hours, while the diameter 5 mm white LED for 20 ~ 28lm / W, life can be more than 100,000 hours. It was also predicted that the future of LED lifetime limit will be infinite.

 

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What are the advantages of LED?
A. Optical Efficiency: spectrum almost all concentrated in the visible light frequency, efficiency can reach 80% -90%. And the luminous efficiency of incandescent is only with almost 10%-20% visible light efficiency.
B. High-quality Light: as a result that there is no ultraviolet and infrared of spectrum, there is no heat, no radiation, and is typically green lighting.
C. Small Energy Consumption: single-power general in the 0.05-1w, through the cluster can be tailored to meet different needs, and waste little. As the light source, in the same brightness, it's power consumption can be only 1/8-10 of ordinary incandescent.
D. Long life: flux attenuation to 70% of the standard life expectancy is 100,000 hours. A semiconductor lamp can be used under normal circumstances 50 years, even if the long life of the people, lives up to it with two lights.
E. Durable and Reliable: No tungsten wire, glass and other easily damaged components, few non-normal retirement rate, and with very low maintenance costs.
F. Flexibility of Application: small size, can flat pack, easy to develop into a short thin products, and can make various forms such as point, line, face of specific applications.
G. Security: working voltage is 1.5-5v or less in between ,and the current is 20-70mA in between.
H. Green: The waste can be recycled and of no pollution. Unlike fluorescent lamps that contains mercury as ingredients.
I. Short Response Time: can adapt to frequent switching and high-frequency operating occasions.

 

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Are LEDs Expensive?
LEDs do cost more to purchase compared to the more conventional energy (in)efficient lamps. This upfront cost is offset by increased reliability, lower energy bills and longevity and can often be paid back within as little as 9 months of purchase (depending on how often the LED is used). After this period you will actually be saving money on your utility bills and replacement lamp costs for many years to come. Not forgetting you will also be doing your bit for the environment too!

 

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Are LEDs really environmentally friendly?
A single kilowatt-hour of electricity will generate 1.34 pounds (610 gm) of CO2 emissions. Assuming the average light bulb is on for 10 hours a day, a single 50-watt halogen lamp will generate 250 pounds (114 kg) of CO2 every year. The 8 watt Eneltec equivalent will only be responsible for 40 pounds (18 kg) of CO2 over the same time span. A building's carbon footprint from lighting alone can be reduced by a staggering 68% by exchanging all conventional style lamps for Eneltec. It is our mission to help reduce your long-term costs and yours to help make a difference toward a cleaner, greener future.

 

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Do LED products give off any heat?
Yes, all LEDs give off heat as a bi-product of the current passing through the semi-conductor. However, Eneltec do not reach the extreme high temperatures experienced using halogen and/or incandescent type lighting. This means more energy is turned into light, far less is wasted and, ultimately, you benefit from a reduced energy cost!

 

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Why Led lamp is the best one for frequently turn on and turn off?
As we all know that incandescent bulbs lights when the current through the tungsten filaments. The cold resist of the tungsten is very small, however, the impulse current is very strong when the bulbs turned on. So frequent turn on or turn off will affect the lamp life.

Fluorescent lamp is a gas conduction product. When it is turn on, with the cooperating of the ballast, starter and other fittings, there will be instantaneous pressure in both ends of tube to make the fluorescent light generated. The oxide coating on the fluorescent filament will be impacted by the ion bombardment under strong electric field, which leads to the most vulnerable damage. So it is not suitable for frequent switching neither.

LED lamps are given light by the light emitting diodes. Light-emitting diode is a semiconductor PN junction. Conductivity of the semiconductor is a one-way conductor. Just like copper, aluminum and other conductors, the current change flowing through the semiconductor (as long as under the rated current and rated voltage range), will not affect the life of the semiconductor. Therefore, in addition to the advantage of small size, low driving voltage, full-color, long life, high efficiency, resistance to vibration and other characteristics, the LEDs have one very important feature of easy to control. Even if the current flowing through the LED changes in high frequency, the LEDs also remain intact.

A typical example is the red, green and yellow LED traffic lights in the crossings. These traffic lights, when red light on, then green light off; when yellow light, then the red and the green lights are off. if the changes happen in every 30 seconds ,then a day should switch 2880 times. And in one year, they have to switch a million times!

 

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Where have LEDs been used in the lighting industry?
LEDs began to be used in the lighting industry in the late 1990’s typically in aesthetic, effect, or specialty lighting applications, including architectural highlighting. The use of LED luminaires in applications such as street lighting, area lighting, parking structures, security lighting, and even general lighting for interior spaces is viable today both economically and from an illumination performance standpoint.

 

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Why does the identical LED chip package lumen depreciate at different rates from manufacturer to manufacturer?
Unlike previous technologies, LED manufacturers have a much greater impact on the rate of lumen depreciation based on their luminaire designs. Thermal design plays a critical role in the rate of lumen depreciation. Therefore you should see variation in lumen depreciation from manufacturer to manufacturer, as well as within different product families offered by the same manufacturer.

 

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What are the advantages to using LED luminaires?
LEDs bring several advantages to the lighting industry, including high efficacy and durability, and, with superior life over other lamp sources, their required maintenance is greatly reduced. This translates into energy savings, maintenance savings, and environmental sustainability. There is also the potential for greater optical control (more controllable source), dimming, instant on/off, and reduced rate of lumen depreciation (potential for long application life).

 

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What's the difference between efficiency and efficacy?
Lighting fixture efficiency is the ratio of the total lumens exiting the fixture to the total lumens initially produced by the light source. For example, if a bare 100W incandescent lamp (light bulb) produces 1,000 lumens, and it is put into a lamp fixture that delivers 700 lumens, this would be an example of a 70% efficient fixture. Efficacy is a term normally used in cases where the input and output units differ. In lighting, we are concerned with the amount of light (in lumens) produced by a certain amount of electricity (in watts). Efficacy = Lumens Per Watt

 

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Why are LEDs considered a GREEN technology?
LEDs are environmentally friendly on many fronts. First, unlike HID (High Intensity Discharge) lamps LEDs contain NO mercury. In addition, some LED luminaires are RoHS (Restriction of Hazardous Substances) compliant and have been designed to provide more than a decade of near maintenance-free service. That means no re-lamping which means no waste.
Assuming an HID fixture is re-lamped every two years, that’s five re-lamping cycles over a 10 year period. Just imagine the benefits of choosing LED:
• No concern over proper disposal (hopefully not simply thrown in a landfill) of old HID lamps containing harmful mercury.
• No fuel used and the accompanying pollution to service those fixtures.
• Greatly reduced potential for lane closures and other productivity and inconvenience-related costs associated with maintaining an HID system.
• No natural resources lost to produce the replacement lamps that contain mercury.
• No fuel used to move old-technology lamps from the factory (most likely overseas), to the distributor, to the contractor, to the job site. It’s important to keep in mind all the positive and powerful ripple effects that using LED technology can have on the environment.

 

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How do you evaluate LED products?
Lumen output is only part of the story and can be misleading. To fully evaluate an LED product one needs to review the overall system efficiency, optical control, thermal management of the LEDs, and know at what point in time the fixture will reach 30 percent lumen depreciation. Products with good optical efficiency and thermal management will be able to deliver more lumens, on average, than traditional HID products.

As the Department of Energy concluded in its Solid-State Lighting Commercial Product Testing Program:
"Until the field of SSL technologies and supporting knowledge matures, any claims regarding performance of SSL luminaires should be based on overall luminaire efficacy (i.e., from testing of the entire luminaire, including LEDs, drivers, heat sinks, optical lenses and housing), to avoid misleading buyers and causing long-term damage to the SSL market."

 

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If an LED fixture has lower initial lumen output than a traditional HID light, how can LED claim to deliver lumens more efficiently than HID?
When you average delivered lumens over the course of 60,000 hours, you'll see that LED outperforms a 400-watt MH lamp operated in a horizontal position. (60,000 hours is used for this comparison to show three full life cycles of the HID.)

The MH's lumen depreciation, as well as optical and ballast losses, quickly reduce output of the HID system. Note that there are three relamps over 60,000 hours.

Conversely, LED has significantly better lumen maintenance and a more efficient driver. Also note that the LED fixture typically doesn't need relamping from zero to 60,000 hours. Combine this with Beta's exclusive NanoOptic and LED outperforms MH over the course of the life of the fixture.

Result: the LED's average delivered lumens is 74% higher than HID over 60,000 hours.

 

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How does ambient temperature affect LED efficiency?
LED fixtures must be designed with junction temperature thermal management as a key component and use the correct LEDs. These products will then be robust enough to operate in most ambient temperature applications. Unlike fluorescent sources, cold temperatures do not impact the performance of LEDs.

 

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Do I have to replace LEDs?
An LED does not burn out like a standard lamp, so individual diodes do not need to be replaced. Instead, the diodes gradually produce lower output levels over a very long period of time. If one LED fails, it does not produce a complete fixture outage.

 

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Why is the life span of an LED measured as lumen depreciation?
The life span of an LED is vastly longer than that of incandescent, fluorescent or HID lamp sources, generally lasting 50,000 hours or longer. Although the LED never really burns out, product life span is measured by lumen depreciation.

The Illuminating Engineering Society's (IES) current standard for calculating the life of an LED as the point at which the LED reaches 30 percent lumen depreciation.

Remember, a 100,000-hour rating is not equivalent to lamp life rating. LED life is rated where it has reached 30 percent lumen depreciation. At 100,000 hours an LED would still be operating, but at a decreased lumen output.

 

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How long is 100,000 hours?
Based on how long a fixture is illuminated per day, here's what 100,000 works out to:

Hours of Operation: 100,000 hours is:

24 hours a day 11.4 years
18 hours per day 14.8 years
12 hours per day 22.8 years
8 hours per day 34.2 years

 

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